Endpoint
POST /v3/onboarding/managed_accounts/create
Authentication and target
A user-scoped credential is required. The owner must have exactly one active Master Account and the managed-account feature must be enabled. Do not send X-ISPB or X-Account-Number. This user-only management route rejects account-targeting headers. For a PA, linked_account is a JSON request-body field, not an account-targeting header.Request body
Success data
reference_id, model, current status, and an optional verification_url.
Behavior and validation
MOR reuses approved Master compliance. VA and PA create independent compliance sessions, so activation is asynchronous. A same-owner/model/reference/parent match reuses the existing identity; keepreference_id stable on retry.
Errors
Every call can fail for missing or invalid signature headers, an expired timestamp, nonce replay, an invalid body hash or signature, insufficient permission, or a downstream service error. Endpoint-specific errors include:field_requiredorfield_invalidfor model-specific field matrix violations.invalid_userwhen an eligible active Master context is unavailable.permission_deniedwhen a linked account is outside the owner’s allowed relationship.