Problems·HTTP 422

invalid-challenge

The proof-of-work challenge was not accepted.

What it means

Every sign-in spends a solved ALTCHA challenge. This one was missing, malformed, unsolved, expired (they last five minutes) or already used.

What to do

Get a new challenge from POST /v1/sign-in-challenges and solve it. einvoicing login does this for you.

Example

Sent as application/problem+json (RFC 9457). Branch on type, which is stable. Never branch on title or detail, which are prose and may change.

{  "type": "https://www.einvoicing.dev/problems/invalid-challenge",  "title": "The proof-of-work challenge was not accepted.",  "status": 422,  "detail": "…"}