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IDProjectCategoryView StatusDate SubmittedLast Update
0010480Talermerchant backendpublic2025-10-09 14:192025-10-09 14:19
Reporteravalos Assigned ToFlorian Dold  
PrioritynormalSeverityminorReproducibilityalways
Status assignedResolutionopen 
Target Version1.2 
Summary0010480: 502 error when paying order with TESTKUDOS:0 tax receipt
DescriptionWhen creating an order in backend.test.taler.net with a TESTKUDOS:0 tax receipt:

ORDER_ID="$(curl "${BACKEND_URL}/private/orders" \
     --header "Authorization: Bearer ${BACKEND_TOKEN}" \
     --data "{
  \"order\": {
    \"version\": 1,
    \"summary\": \"Test donation order\",
    \"choices\": [{
      \"amount\": \"TESTKUDOS:0\",
      \"inputs\": [],
      \"outputs\": [{
        \"type\": \"tax-receipt\",
        \"amount\": \"TESTKUDOS:0\",
        \"donau_urls\": [
          \"https://donau.test.taler.net/\"
        ]
      }]
    }]
  }
}" | jq -r .order_id)"

And then paying it with the wallet, the exchange returns 502 with an empty error response:

{
  "code": 7002,
  "hint": "Error response did not even contain JSON. The request URL might be wrong or the service might be unavailable.",
  "message": null,
  "when": {
    "t_ms": 1760010931804
  },
  "requestUrl": "https://backend.test.taler.net/instances/sandbox/orders/2025.282-03G6X9REDYVN6/pay",
  "requestMethod": "POST",
  "httpStatusCode": 502,
  "response": "",
  "contentType": "<null>"
}

This is what the wallet sends to the merchant:

2025-10-09T12:07:32.561Z pay-merchant.ts INFO sending donau data: {
  "url": "https://donau.test.taler.net/",
  "year": 2025,
  "budikeypairs": []
}

This is what appears in the logs:

Oct 09 12:01:21 cceb10198446 taler-merchant-httpd[39649]: (25K7J8R34P1HFWFB60SWEXC9EG) WARNING External protocol violation detected at taler-merchant-httpd_post-orders-ID-pay.c:4376.
Oct 09 12:01:21 cceb10198446 taler-merchant-httpd[39649]: (25K7J8R34P1HFWFB60SWEXC9EG) ERROR Assertion failed at taler-merchant-httpd_post-orders-ID-pay.c:820. Aborting.
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Issue History

Date Modified Username Field Change
2025-10-09 14:19 avalos New Issue
2025-10-09 14:19 avalos Status new => assigned
2025-10-09 14:19 avalos Assigned To => Florian Dold
2025-10-09 14:19 Florian Dold Target Version => 1.2