Authentication
KYC endpoints use the same Ed25519 signed-API scheme as the MID endpoints —Partner-App-Key, X-HSPay-Signature, and X-HSPay-Timestamp headers. See Request Signing.
Fields
Some fields are required for your account. Holdstation configures the required set per partner; contact us to confirm which fields apply to you. A create or update is rejected with
MISSING_REQUIRED_FIELD if a required field is empty (or, for id_type / sex, left unspecified / 0).