Updatable fields
Add transfer types to an existing address
To add new rails to an existing address (for example, addingach_credit and same_day_ach_credit to an address), send a PATCH to the same endpoint with additional_transfer_types:
Request
additional_transfer_types is merged into the address’s existing transfer_types. You do not need to resend the full existing list — send only the rails you want to add. Sending a transfer type that is already enabled is idempotent.
Error responses
400— invalid or incompatible transfer types, attempting to archive a pending address, attempting to unarchive a custodial address, or invalid status value.404— address not found or not owned by the account.
addresses:write