| Description | When 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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