subscription_terms_unsigned
The same route with a custom, comped, or prepaid terms row carrying no order_acceptance_id. It is the CHECK that makes a paperless deal of those shapes unrepresentable rather than merely refused, modelled on commitment_reconciles. Nothing was written.
Problem shape
Every non-2xx response is an RFC 9457 application/problem+json body. The type URI below is stable and machine-matchable, so branch on the final path segment (the code) and treat the status as redundant confirmation. See the error-handling guide.
{
"type": "https://docs.vocapable.com/errors/subscription_terms_unsigned",
"title": "…",
"status": 422,
"detail": "…",
"instance": "/v1/…"
}