user_id. To fund cards yourself, use the company wallet instead.
kyc_required. The response then carries a checkout_url. Send it to the user: Agentcard covers the provider fee, so send the exact amount the user should receive. Learn when the money lands from a fresh read of the funding session.
The first funding needs a verified phone. Without one, the request is refused:
checkout_url is null, and the phone code is always 111111.