# SlipOK integration checkpoint — 2026-10-01

## Result

Implementation and mocked regression verification PASS. Live quota connectivity
BLOCKED: configuration missing/incomplete. No external quota/slip request was
sent by the probe. Live slip verification BLOCKED: no configured credentials or
owner-supplied isolated test slip/payment was available. These are not live E2E
passes. No main Backend restart or application payment write was performed.

## Architecture before / after

Before: Payment API -> SlipVerificationService -> DemoSlipVerifier or generic
RealSlipVerifier. Existing private evidence storage, payment ownership,
finalized winning-bid validation, verification metadata, and unique indexes.

After: same API/service/storage/DB contract, with a backend-only SlipOkVerifier
adapter. Configured SlipOK takes precedence over Demo; partial configuration
fails closed. Demo requires explicit TRAVELIN_SLIP_PROVIDER=demo in non-production
mode; enabling development accounts alone no longer implicitly selects Demo.
The legacy generic RealSlipVerifier remains available via explicit real mode.

The adapter posts multipart files with log=true and the persisted payment's
expected amount to a fixed HTTPS host, with redirects disabled. Both provider
success flags are required. SlipOK's branch receiver validation is used because
its receiver account value is masked, not a plaintext account number. The service
still validates amount, transaction reference and timestamp against its existing
date policy. Only masked receiver metadata is persisted.

Backend additionally rejects disagreement between payment amount and winning bid,
checks transaction-reference reuse across payments, coalesces concurrent retries
for the same user/payment within this backend process, and rejects stale evidence
when locking the payment for either acceptance or rejection. Existing paid
idempotency and DB uniqueness remain authoritative.

## Configuration (names only; no credential values)

- SLIPOK_API_KEY
- SLIPOK_BRANCH_ID
- Optional TRAVELIN_SLIP_PROVIDER=slipok for explicit selection.
- TRAVELIN_ENV=production or prod prohibits Demo.

Created config/local_secrets.example.bat with exactly two empty set commands.
Created config/local_secrets.bat only because it did not exist; it is an empty
owner-fill template and is ignored by .gitignore. Do not distribute this real
file after filling it. Restrict access to the owner's Windows account.

start_tourapp.bat loads the local file only in its Backend child, before Dart
starts, with delayed expansion disabled and output suppressed. Portal/Flutter
children do not inherit keys loaded by that child. Existing MariaDB persistent
console/startup/readiness, Portal and Android flow were not changed. An already
running Backend is reused by the launcher and will NOT reload newly entered
environment variables: stop/restart only Backend cleanly when ready; do not stop
MariaDB or close its console for this integration.

The example/template intentionally has no additional variables or real secrets.
Branch/key are not returned in User APIs, checkpoint, or diagnostic output.

## Database compatibility and safety

Read-only information_schema checks on the running MariaDB confirmed existing
amount, verification_provider, transaction_reference, transaction_at,
verified_amount, verified_receiver, evidence_sha256 and associated verification
fields. Existing unique evidence and provider/reference indexes are present.
No migration, account/grant change or schema write was necessary/performed.

No business data was created, updated, deleted or cleaned up. Groups #115 and
#102 and their histories were not modified. MariaDB datadir, configuration,
recovery backups and startup process were not touched. No real payment provider
transaction or paid business record was created.

## Error behavior

- Invalid image/QR/slip: understandable invalid-slip message.
- 1012: duplicate slip; rejected, no reused reference stored on a failed payment.
- 1013: amount mismatch.
- 1014: receiver mismatch.
- Configuration/package/quota/bank errors, HTTP 429/5xx, malformed response,
  network error and timeout: unavailable/retryable, never described as fake slip.
- Missing configuration: safe unavailable status; Backend startup does not crash.

Raw provider messages, authorization headers, request URLs containing branch
identifiers, image bytes/base64 and transport exception details are not logged.
Images are magic-byte checked (JPEG/PNG/WebP), at most 5 MiB; response parsing is
bounded to 1 MiB. No redirects forward authorization headers elsewhere.

## Files changed/created

- server/slipok_verifier.dart — adapter, quota probe API and provider factory.
- server/slip_verification_service.dart — provider validation result and retry gate.
- server/gemini_proxy.dart — factory wiring, safe startup status, persisted amount,
  transaction reuse and stale evidence guards.
- server/slipok_quota_smoke.dart — read-only, redacted standalone quota probe.
- start_tourapp.bat — backend-child secret loading only.
- .gitignore — excludes config/local_secrets.bat.
- config/local_secrets.example.bat — empty example.
- config/local_secrets.bat — empty local template, never commit.
- test/server/slipok_verifier_test.dart — mocked provider/security/retry tests.
- test/server/slipok_configuration_test.dart — launcher/config/API source contracts.
- audit/slipok_integration_20261001.md — this checkpoint.

Flutter code, Rating, Matching, Poll, Voting rules and Payment UI were unchanged.

## Test evidence

Final commands:

```
dart analyze server test/server/slipok_verifier_test.dart test/server/slipok_configuration_test.dart
flutter analyze
flutter test test/server/slipok_verifier_test.dart test/server/slipok_configuration_test.dart test/server/slip_verification_service_test.dart test/server/slip_verification_migration_test.dart test/server/voting_policy_test.dart --reporter compact
```

- Dart analysis: PASS, no issues.
- Flutter analysis: PASS, no issues (56.6 seconds).
- Final targeted suite: PASS, 49 tests (27 adapter/gate, 3 configuration/source
  contracts, 5 existing verifier, 1 existing migration contract, 13 voting policy).
- All provider tests use injected fake HTTP clients; none calls SlipOK.
- Cases include valid multipart, local wrong-amount check, duplicate, receiver,
  invalid slip, configuration/package/quota/bank failures, network/timeout,
  missing config, invalid/oversized file, incomplete receiver, quota contract,
  production/demo selection and simultaneous/retried verification.
- An intermediate source-contract assertion failed due to formatting whitespace;
  normalized that assertion. Final 49-test run passed. No provider behavior bug
  was hidden by that change.
- Live quota probe was invoked through cmd with local environment loading and
  output suppression. It returned BLOCKED (missing/incomplete configuration),
  before network access. No secrets were output.
- No live DB Payment API round-trip or new Emulator payment verification claimed.

## Resume / live verification

1. Owner fills the two variables privately in config/local_secrets.bat and checks
   that SlipOK branch receiver configuration is correct. Do not send keys here.
2. Read-only quota probe from the app directory:

```
cmd.exe /d /c "call config\local_secrets.bat >nul 2>&1 && dart run server/slipok_quota_smoke.dart"
```

3. Restart only Backend to load new code/environment through the normal launcher.
   Reused running Backend will not load the new adapter automatically.
4. Use an owner-prepared slip and a safely isolated test payment record with the
   intended expected amount/branch. Make only one real verification request.
   Do not test on #115/#102 or create a paid main-business row merely for proof.
   Stop before live write if no isolated payment is available.

## Limitations / rollback

SlipOK log=true registration and local DB commit are separate operations. If a
provider succeeds but its response/DB commit is lost, a retry can report duplicate;
the system will not infer paid from a duplicate. Such a case needs reconciliation,
not a Demo fallback. The in-process retry gate is not a distributed lock; existing
DB uniqueness remains the final protection. No background retry/reconciliation
feature or migration was added.

Rollback requires no DB restore. Stop only Backend; restore the prior focused
backend/launcher versions from the owner's source checkpoint, retaining ignored
secrets privately. Alternatively use the retained generic real adapter with its
previous authorized environment configuration, after explicitly clearing SlipOK
variables in that Backend environment. For isolated automated/development tests
only, explicitly select demo in non-production with SlipOK variables unset.
Never use Demo as a workaround for a failing real business payment. No schema,
MariaDB recovery or historical payment changes need rollback.

Official contract references:

- [Check slip](https://slipok.com/api-documentation/check-slip/)
- [Error status codes](https://slipok.com/api-documentation/error-status-code/)
- [Quota endpoint](https://slipok.com/api-documentation/check-slip-quota/)

## Follow-up: owner-configured live connectivity and Backend restart

Owner authorized opaque environment loading and one provider-only one-baht slip
probe. Neither credential file contents nor credential values were displayed.

### Configuration / provider selection

Both environment variables were present and the key passed header safety checks.
The original numeric-only branch guard rejected the supplied nonnumeric ID before
network access. Official endpoint documentation does not specify numeric-only
branch IDs, so the guard now permits a bounded safe opaque path segment
(letters/digits/underscore/hyphen), still rejecting slash, URL, query, control
characters and traversal. This is not proof that the supplied ID is a valid
SlipOK branch; only a successful provider response can establish that.

The actual environment factory selected SlipOkVerifier, not Demo. The restarted
Backend also emitted its credential-free configured SlipOK startup message.

### Actual quota result

Two GET requests were made to the fixed official quota endpoint: the second was
solely to capture a sanitized numeric error code after the first HTTP rejection.
Both returned HTTP 422. Latest error code: 1000. No successful quota data was
returned; remaining quota is UNKNOWN, not zero. QUOTA PASS: NO.

Official error documentation associates 1000 with missing slip QR/file/url input,
which is unexpected for the documented GET quota request. Therefore do not assert
that the key is invalid, the branch is absent, or the package is exhausted from
this evidence. Verify the branch identifier in the owner's SlipOK dashboard and,
if needed, clarify this quota response with SlipOK support using only sanitized
HTTP/method/error-code evidence. Do not put credentials in a support screenshot.

The diagnostic now reports only configuration booleans, verifier name, HTTP
status, numeric provider error code, and quota numbers on a successful response.
It never logs the raw provider response.

### Backend / MariaDB

Verified old Backend PID 25036, Dart executable and matching server command before
stopping. Its parent was the Backend launcher console. Attached to that console,
confirmed no mysqld process shared it, sent CTRL+C, and verified Backend exited.
Started exactly one replacement Backend on 8787 (PID 23636) with local secrets
loaded privately. No second Backend listener was started.

Startup seed and Admin bootstrap variables were disabled for this replacement
process only, to avoid writing/resetting accounts during a connectivity smoke
test. No persistent launcher/config/account change was made for that suppression.
Development tools gated by the account flag are consequently disabled in this
smoke process; ordinary authentication uses the existing accounts. Normal future
launcher startup still uses its existing development flag policy.

After restart: health HTTP request succeeded, ok=true,
databaseConfigured=true. MariaDB PID 19300 and its original start time were
unchanged across the Backend stop/start. MariaDB was not restarted or signalled.

### Owner-specified slip / writes

The exact owner-specified local path was checked as a file. It did not exist.
The provider-only probe therefore stopped before reading image content or making
a POST. Actual slip POST requests: ZERO. LIVE VERIFICATION: BLOCKED, not PASS.
No retry, wrong-amount request or duplicate slip request was sent.

No Payment API was called and no payment status was changed. No DB rows/schema,
groups #115/#102, datadir or recovery backups were changed by these checks.
No image, account data, transaction reference or credentials were stored in
source, Git or this checkpoint. No cleanup was performed.

### Focused files and verification in this follow-up

- server/slipok_verifier.dart: safe opaque branch guard; quota status/error metadata.
- server/slip_verification_service.dart: optional sanitized exception status/code.
- server/slipok_quota_smoke.dart: credential-free configuration/status/quota output.
- server/slipok_slip_smoke.dart: standalone one-baht, one-call, provider-only probe;
  no DB imports/writes, no raw response output, no retry.
- test/server/slipok_verifier_test.dart: branch safety, quota metadata/redaction.
- This checkpoint.

Dart analysis of changed service/adapter/quota helper and separate slip helper:
PASS, no issues. Final targeted verifier/configuration/existing-service suite:
37/37 PASS, entirely mocked. No large QA suite was rerun.

Next actions: owner confirms the actual branch ID privately in the local file,
supplies a corrected existing absolute slip path, then repeat only the read-only
quota check. Do not automatically re-run the slip helper: the owner-authorized
single POST remains unused, and any future invocation must first confirm that
no previous POST was sent. Use provider-only testing, not a real business Payment,
unless a safely isolated test Payment fixture is available. Quota connectivity
and successful real-slip validation remain unverified.

## Follow-up: quota target verification and slip folder resolution

### QUOTA API: FAIL

Checked the current official documentation: GET to the API branch path ending
in /quota, authenticated with x-authorization. A credential-free diagnostic
client verified the actual outgoing request had all of:

- GET method, HTTPS, official api.slipok.com host;
- exactly api/line/apikey/[redacted single branch segment]/quota;
- redirects disabled; not the POST slip-verification endpoint.

Environment was loaded without displaying credentials. Branch input is not a
whole URL, not one of the known template placeholders, not the reserved quota
segment, and not equal to the API key. It is nonnumeric; this alone does not prove
it is invalid. No branch values were printed, guessed or rewritten.

Exactly ONE additional live GET was sent in this follow-up. Response: HTTP 422,
numeric provider code 1000, no successful quota data. Remaining quota UNKNOWN.
No code bug in method/URL assembly was demonstrated. The unexpected error must
not be labelled quota exhausted, invalid API key, wrong receiver or invalid slip
without further evidence. The official 1000 definition concerns missing slip
input; that is unexpected for this correctly targeted GET quota request.

Required owner/provider follow-up: privately check that the configured value is
the API branch identifier from the correct SlipOK dashboard, not a branch name or
another identifier. If correct, ask SlipOK support about GET quota returning
422/code 1000, using only the redacted route/method/status/code. Never send keys or
full branch values in this report. No further live requests were attempted.

### SLIP FILE: FOUND

The owner clarified that slip-test.png is a directory. Inspected only files
directly inside that specified directory. Exactly one PNG/JPEG-named image was
present; Windows image decoding succeeded. Actual format: JPEG; within 5 MiB.
Its absolute file path was resolved privately. No image was displayed, no QR was
decoded, and neither filename/account/QR content nor image bytes were copied
into this report/source/Git.

The standalone slip helper now accepts either a file path or this folder. It
resolves one PNG/JPEG image to its absolute path in memory and blocks empty or
ambiguous folders rather than choosing arbitrarily. It still makes at most one
provider request per invocation, without automatic retries or database writes.
The helper was NOT invoked against the real slip because the quota gate failed.

### LIVE SLIP VERIFICATION: BLOCKED

Actual slip POSTs in this follow-up: ZERO. Actual slip POSTs since integration:
ZERO. No live valid/wrong-amount/duplicate/receiver result is claimed. These
classifications remain covered by mocked adapter tests only. Once quota passes,
the authorized one-baht provider-only probe can use the existing folder directly;
do not use a real group/payment or issue duplicate/wrong-amount live calls just
for test coverage.

### Files / test evidence / safety

Changed:

- server/slipok_quota_smoke.dart: configuration-only mode, structural request
  diagnostics and fail-closed official-quota-target check, no secret output.
- server/slipok_slip_smoke.dart: safe single-image folder resolution.
- test/server/slipok_verifier_test.dart: exact quota GET path for numeric/opaque
  fixture IDs, rejection of full URLs before any authenticated request.
- test/server/slipok_smoke_file_test.dart: single-file/folder and ambiguity tests.
- This checkpoint.

Dart analyze for the adapter and both smoke helpers: PASS, no issues. Existing
verifier/configuration/service targeted suite: 40/40 PASS. Folder resolver suite:
2/2 PASS. Total 42 successful targeted tests, no live provider calls in tests.
An intermediate folder test failed because expected path used mixed Windows path
separators; corrected the fixture path using Platform.pathSeparator. No image
content or business behavior was changed to pass that test. All temporary files
were created and removed only by that test's own temporary-directory teardown.

Backend health remained ok=true and databaseConfigured=true. No Backend/MariaDB
restart, credential/config edit, schema/write SQL, Payment call, datadir/recovery
operation or business cleanup was performed in this follow-up. Groups #115/#102
and their histories were not changed. No Demo fallback was used.

## Follow-up: authorization-gated provider diagnostic

Request timestamp: 2026-10-01 14:13:46 +07:00 (Asia/Bangkok, Gregorian).

Reloaded local environment opaquely. Key and branch configured; current branch
input is numeric, not a URL/template, and differs from the key. Factory still
selects SlipOK, not Demo. Credential presence is not proof of authentication or
of matching the Dashboard's API branch. No credential values were displayed.

Sent exactly ONE GET quota request in this follow-up; outgoing request metadata
confirmed the official HTTPS quota target, GET and no redirects. Result:

- HTTP status: 401.
- Provider code: 1002 (authorization header rejected by SlipOK).
- Remaining quota: UNKNOWN; no successful quota response.

This is the latest response, not the previous 422/1000. Do not falsely classify
it as missing branch, wrong amount, wrong receiver, duplicate slip or quota
exhausted. The provider rejection establishes an authorization blocker; it does
not distinguish an incorrect/revoked key, mismatched key/branch configuration, or
credential-loading syntax damage. Those require owner-side checking with the
current Dashboard. No credentials were guessed or edited.

Dashboard branch match and receiver-account binding have NOT been independently
verified. Requested owner confirmation without asking for identifier/account/key
values. Because authorization failed and those preconditions remain unverified,
the condition for the one allowed log=true provider-only diagnostic POST was not
satisfied. Slip POSTs this follow-up: ZERO; since integration: ZERO. The unused
single-POST allowance must not be spent automatically or retried later.

LIVE SLIP VERIFICATION: BLOCKED (authorization/preflight). Existing uniquely
resolved JPEG remains available; it was not read/uploaded again in this follow-up.

Next: owner privately checks the key and API branch pair in the same Dashboard,
confirms that the receiver is bound, and corrects local environment if necessary.
Do not paste credentials into chat/support logs. After that, perform one fresh
read-only authorization check; only then consider the one provider-only one-baht
POST. If SlipOK still returns the error, provide support only the above timestamp,
HTTP status and numeric provider code.

No Payment, source business logic, local credential file, account, schema,
MariaDB/datadir/recovery data or groups #115/#102 were changed. No service was
restarted. Only this checkpoint was edited. Prior targeted tests remain the
latest automated evidence (42 PASS); no Full QA or redundant test suite rerun.

## Follow-up: corrected credentials, restart and first real slip POST

### BACKEND RESTART: PASS

Loaded local configuration opaquely and checked only booleans: key present,
branch present, key is NOT an absolute URL. No secrets were displayed or edited.
Owner states the branch was taken from the Dashboard.

Verified the old Backend identity (PID 23636, expected Dart/server), sent CTRL+C
through its owned console session, and confirmed it exited and port 8787 was free
before starting its replacement. No duplicate Backend was started. Replacement
loaded the new environment, emitted configured SlipOK (not Demo), and health
returned ok=true, databaseConfigured=true with one Backend listener.

As previously documented, startup seed/Admin bootstrap were disabled for this
replacement process only to prevent account writes during connectivity checks;
no permanent launcher/config/credential changes. MariaDB PID 19300 and original
start time remained unchanged. No MariaDB restart/signalling occurred.

### SLIPOK AUTHORIZATION: PASS; QUOTA: PASS

Exactly ONE live GET quota request this follow-up, started
2026-10-01 14:27:23 +07:00 (Asia/Bangkok, Gregorian).

- HTTP 200, successful authenticated quota response.
- Provider error code: none (success).
- Remaining quota BEFORE slip POST: 100; overQuota: 0.

The prior 401/1002 and 422/1000 are historical failures, not the current quota
result. Do not fabricate quota results or claim an endpoint issue persists after
this successful response. No second quota request was made after the POST; the
post-verification remaining quota is unmeasured.

### LIVE SLIP VERIFICATION: PARTIAL — receiver mismatch

Owner explicitly confirmed via the question response that the branch receiver
was bound and matched the one-baht slip. Preflight confirmed exactly one readable
PNG/JPEG file inside the specified folder, within 5 MiB. No image or QR content
was displayed/copied and no customer/account/transaction identifiers were logged.

Sent exactly ONE provider-only POST starting
2026-10-01 14:28:09 +07:00, multipart files, amount=1.00, log=true. No Payment API,
database fixture or real Payment record was used.

- HTTP 400.
- Safe mapped result: receiver account does not match the branch configuration.
- This result maps to SlipOK code 1014 in the current adapter (the helper did not
  persist the raw provider body/code; attribution is from the unique mapper).
- Verification did NOT PASS. The rejection does not establish wrong amount,
  invalid QR/fake slip, duplicate transaction or quota exhaustion.
- False metadata-presence/amount/receiver flags in the helper are due to the
  error result omitting success data; they are not separate diagnoses.

POST allowance was used: exactly ONE real slip POST since integration. No retry
or duplicate/wrong-amount probe was sent, and none is authorized automatically.
No Payment was marked paid and no application DB writes were made. A log=true
provider request may have provider-side logging/quota effects; there is no claim
that the provider's own state remained unchanged.

Next: owner checks the actual receiving account on the slip against the account
bound to this same SlipOK API branch, including bank/account or PromptPay
configuration as applicable. The provider result conflicts with the owner's
preflight confirmation; use that evidence rather than overriding validation.
Do not weaken receiver checks, change to log=false or Demo, or retry until the
owner has corrected/confirmed the binding and explicitly authorizes another
limited request. For support, provide only the timestamp, HTTP 400 and mapped
receiver-mismatch category/code, no account, key, slip/QR or transaction reference.

No source/Payment business logic changes or new tests were necessary; prior
42 PASS targeted tests were reused, not rerun. Only this checkpoint was edited.
Groups #115/#102, MariaDB/datadir/recovery backups, schema and business payment
history were not modified. No Full QA or cleanup was started.

## Follow-up: replacement slip preflight — amount confirmation required

Owner explicitly states the old slip was removed and a new slip paid to the
bound receiver was placed in the same folder. Exactly one readable JPEG was
found, 107558 bytes, modified 2026-10-01 14:32:24 +07:00, later than the old
14:28:09 POST. This supports the owner's replacement statement. The old
checkpoint has no old image hash/size/filename baseline, so byte-for-byte
difference from the old image cannot independently be proved; do not claim it.

Current replacement image SHA-256 (file fingerprint only, no image/QR/account):
6C22CFD19F1ADBE82B6A8CF2742425E2E1E6ABCFC9B2BF5F5BFE0F4FCA7DEE19.
Use this fingerprint to guard the next authorized attempt against a file change.

Windows OCR ran locally in memory only, with output restricted to amount
candidates associated with amount/currency labels. OCR was available but yielded
no confidently labelled amount. No OCR text, QR, customer/account details or
image was displayed, uploaded or persisted. Did not infer the amount from the
old one-baht slip or from the fixed default in the existing smoke helper.

LIVE VERIFICATION: BLOCKED before POST, pending owner's exact amount confirmation.
Quota requests this follow-up: ZERO. Slip POSTs this follow-up: ZERO. HTTP status
and provider code: not applicable (request not sent). Previous old-slip POST is
still the sole real POST so far; the authorization for one new-slip POST remains
unused. No automatic retry or provider/payment call was made.

Next: ask owner for the exact amount shown on the new slip. Before sending once,
recheck the same image fingerprint and use that confirmed amount; do not use the
one-baht default unless that is the explicitly confirmed amount. If the helper
needs a different amount, change only the standalone diagnostic input, never
production Payment rules. No source/config/DB/service/MariaDB changes were made
in this preflight; only this checkpoint was updated.

## Follow-up: owner-confirmed one-baht replacement slip — one POST completed

Owner confirmed the new slip amount is exactly 1 baht. Rechecked that exactly one
image remains and its SHA-256 matches the replacement preflight fingerprint above.
Held a read-only file handle denying writes/deletion during the probe, without
copying the image. This verifies continuity with the replacement preflight, not
byte-for-byte difference from the old slip whose fingerprint was never recorded.

Exactly ONE provider-only POST was sent for this replacement slip, starting
2026-10-01 14:41:47 +07:00 (Asia/Bangkok, Gregorian), files multipart,
amount=1.00, log=true. No quota GET, retry, Payment API or DB write occurred.

### LIVE SLIP VERIFICATION: PARTIAL

- Actual HTTP status: 200.
- Numeric provider error code: none in the decoded provider response.
- Local adapter result: unavailable because receiver metadata was incomplete
  according to the existing adapter's receiver validation.
- The existing control path reaches this check only after the provider's root
  success and data.success checks pass. This is control-flow evidence, not a
  stored raw response. Do not call it a receiver-mismatch provider code 1014,
  invalid/fake slip, wrong amount, quota failure or full verification PASS.
- The adapter did not return a completed result, so actual returned amount,
  receiver fields, transaction reference and timestamp were not independently
  recorded/verified. Owner-confirmed expected amount was 1.00.

The provider's successful log=true response may have registered the slip and
consumed quota. Do NOT automatically send this replacement image again; a new
POST requires explicit owner authorization and may be rejected as duplicate.
Total real slip POSTs since integration: TWO (one rejected old slip, this one
replacement slip). Each was independently authorized; no automatic retries.

Next issue is the adapter's receiver response-shape compatibility. The raw
response was not retained or logged, so exact missing fields cannot be identified
from this run without guessing. Diagnose with documented contract/isolated
fixtures or privacy-safe field-presence metadata under a separately authorized
future probe. Do not weaken receiver validation or change Payment business logic
merely to declare PASS, and do not rerun the same slip to obtain a raw response.

Focused diagnostic change: server/slipok_slip_smoke.dart now captures only the
actual numeric provider code from its bounded in-memory response, then passes
the response unchanged to the existing adapter. It never logs/saves provider
body, bank/account/QR/reference data. Added parser/redaction cases in
test/server/slipok_smoke_file_test.dart. Dart analysis PASS, 4/4 focused tests
PASS with synthetic fixtures only; no Full QA run.

Only those diagnostic/test files and this checkpoint changed. No real Payment
status, groups #115/#102, DB schema/data, credentials, Backend/MariaDB process or
recovery files were changed. No secret or private image was copied into Git or
checkpoint, and no cleanup was started.

## Follow-up: response mapping only — no provider requests

Reviewed local `C:/Users/Asus/Downloads/SlipOK API Guide.pdf`, Version 1.13,
especially receiver schema and pages 6/8/10 describing log=true, masked values,
bank versus proxy accounts and receiver mismatch code 1014. Public official
documentation also consulted: https://slipok.com/api-documentation/check-slip/
and https://slipok.com/api-documentation/error-status-code/.

Confirmed adapter issue: it unnecessarily required a nonempty account.value or
proxy.value even after a successful backend-controlled log=true request. These
values are masked receiver display metadata; provider branch receiver validation
is performed by log=true and mismatch is reported as 1014. Bank and PromptPay
paths already existed; this is not a new provider or Payment implementation.

Mapping now permits omitted account/proxy values after HTTP 200, root.success
and data.success are both true, and no provider error code is present. Receiver
must still be a nonempty object and receivingBank must still be present. Missing
display value is stored as null, not an invented account. Error 1014 always
rejects, even if success flags/receiver are also present. Existing amount,
transaction reference, transaction timestamp and database dedupe safeguards are
unchanged. No schema/configuration change or Backend restart was performed.

Evidence boundary: previous live response was not retained. Its safe checkpoint
cannot distinguish missing receiver object, missing receivingBank, or missing
account/proxy value. Therefore the exact live failing field remains UNKNOWN;
the contract-based overstrict mapping is confirmed, but it is not proved to be
the specific cause of that live result. A truly absent receiver still fails
closed. HTTP 200 and success-check control-flow evidence remain the only live
evidence; actual returned amount/reference/timestamp were not independently
verified. LIVE SLIP VERIFICATION remains PARTIAL, not upgraded to PASS.

Changed this follow-up:
- server/slipok_verifier.dart
- test/server/slipok_verifier_test.dart
- this checkpoint

Validation:
- dart analyze server/slipok_verifier.dart server/slip_verification_service.dart
  test/server/slipok_verifier_test.dart: PASS, no issues.
- flutter test test/server/slipok_verifier_test.dart
  test/server/slip_verification_service_test.dart
  test/server/slipok_configuration_test.dart
  test/server/slipok_smoke_file_test.dart: PASS, 56/56 tests, mock HTTP/local
  fixtures only. Added 12 receiver/required-field regression cases. Initial run
  exposed a nullable fixture-map typing issue; corrected fixture typing and the
  complete focused rerun passed. No real provider calls in automated tests.

Quota GETs: ZERO. Slip POSTs: ZERO. No slip resent, Payment status changed,
MariaDB accessed/modified, #115/#102 data changed, or credential/private response
written to logs/checkpoint. Future live confirmation requires a separately
authorized new slip/probe; do not resend the already logged replacement slip.

## Acceptance safety review — supersedes omitted-value allowance above

No SlipOK API request, DB access/write, service restart or real slip was used.
Re-read v1.13 receiver-comparison notes and log=true contract and cross-checked
the official Check Slip / Error Status Code documentation. log=true checks the
registered branch receiver and duplicates; data.success alone describes valid
QR, not independent receiver proof. Proof requires the backend-controlled
authenticated HTTPS log=true request, HTTP 200, literal root.success=true and
data.success=true, and absence of provider error, including 1014.

Contract uncertainty: v1.13 describes masked account/proxy values and says one
of the two fields may be present. It does NOT explicitly endorse BOTH values
being absent. The previous follow-up overstated this compatibility guarantee.
Conservatively restored fail-closed behavior for both absent/blank values:
SlipVerifierUnavailable (incomplete response, not an accusation of invalid slip).
No full account number is required: bank-only, proxy-only and masked values
remain supported. Truly absent/empty/invalid receiver or absent receivingBank
also fails closed. Receiver object/name alone cannot make a payment valid.

Required checks retained: persisted payment amount versus winning bid before
provider call; provider request amount and local amount check (existing 0.01
tolerance); nonempty transRef and valid transaction timestamp; 1012/1013/1014
reject before mapping even with success flags. Existing duplicate protections
were read in source: provider log=true, cross-payment transaction-reference
query, unique (verification_provider, transaction_reference), unique evidence
SHA256, per-payment coalescing, paid idempotency and locked stale-evidence check.
These are code/migration evidence, NOT a live assertion that isolated database
indexes or concurrent DB behavior were checked this round.

Changed: server/slipok_verifier.dart (tightening only),
test/server/slipok_verifier_test.dart, this checkpoint. Added 7 cases covering
root.success false/null/string, data.success null/string, blank reference, and
1012 overriding success. Replaced the previous both-values-absent acceptance
case with fail-closed coverage; existing 1014/receiver/amount cases preserved.

Results: focused dart analyze PASS, no issues. Focused flutter test across
slipok_verifier_test, slip_verification_service_test, slipok_configuration_test,
slipok_smoke_file_test and slip_verification_migration_test PASS 64/64.
All provider HTTP is mocked; DB guard coverage includes source-contract tests,
not live transaction tests. No full QA run.

READY FOR ISOLATED PAYMENT E2E: YES for mock-provider/normal contract responses,
conditional on provisioning an isolated DB, restricted DB credentials and
authenticated DEMO fixtures. NOT a claim that live SlipOK Payment E2E passed.
LIVE VERIFICATION remains PARTIAL; missing-field live shape still unknown.
Before accepting a genuinely both-values-missing live response, obtain explicit
provider clarification or independent documented receiver verification evidence.
Do not resend the old logged slip. A future authorized live test needs a new
slip and safe isolated Payment record. Backend must load changed source before
that future test; not restarted this round. #115/#102, business payments,
MariaDB/recovery files and credentials unchanged.

## 2026-10-05 — receiver verification follows successful log=true result

This update supersedes the preceding local receiver-field requirement. The
reported “receiver data incomplete” message could only be emitted after the
adapter had passed its successful HTTP/root/data checks and then found one of
these local-shape conditions: absent/empty receiver object, absent
receivingBank, or both account.value and proxy.value empty. The saved evidence
does not identify which condition occurred in that live response.

The backend sends log=true. Receiver verification is now provider-authoritative
only after HTTP 200, root.success=true, data.success=true, and no numeric
provider error code. Optional receiver/account/proxy/name/bank display fields
no longer block that result; any available account/proxy value is masked before being retained
for audit, otherwise the local receiver audit value is null. Code 1012/1013/1014
still rejects as duplicate, amount mismatch, and wrong receiver respectively.
The existing Payment-record amount check, provider amount check, required
transRef/timestamp checks, and cross-Payment duplicate-reference protections
remain in place.

Added one sanitized diagnostic line per parsed provider response: HTTP status,
numeric provider code, and field-presence booleans only. No API key, receiver
identifier, response body, or slip data is logged. No live provider call, slip
retry, DB read/write, or payment-state change was made in this update.

Validation: focused Flutter tests for SlipOK verifier/service/configuration,
smoke file and migration passed 68/68; targeted dart analyze passed with no
issues. All HTTP cases use mocks. The earlier live result remains PARTIAL: the
new mapping has not been exercised against a new live response. Restart only
the Backend serving the payment API (8787 on the main setup) to load this code;
do not resend the already submitted slip, because the log=true request may have
registered it with SlipOK.