CREDENTIAL_TYPE_REQUIRED
400invalid_requestcredential_type is missing.
Cause
The vault boundary is snake_case-only, so a camelCase `credentialType` arrives empty.
How to fix it
The vault boundary is snake_case-only — a camelCase `credentialType` does not resolve and arrives empty.
Example response
400 CREDENTIAL_TYPE_REQUIRED
JSON
{
"error_code": "CREDENTIAL_TYPE_REQUIRED",
"error_type": "invalid_request",
"error_message": "credential_type is missing.",
"hint": "The vault boundary is snake_case-only — a camelCase `credentialType` does not resolve and arrives empty.",
"docs_url": "https://docs.billerapi.com/errors/CREDENTIAL_TYPE_REQUIRED",
"request_id": "d94f5e2a-8c3b-4f1e-9a7d-6b2c1e0f8a34"
}Related
- Error handling — the error envelope shape and how to parse it
- Error code reference — every stable error code
Canonical docs URL: https://docs.billerapi.com/errors/CREDENTIAL_TYPE_REQUIRED
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