Create patient payment

Records an already-collected patient payment. Each request may contain only claim_by_id allocations or only appointment_by_id_and_patient_external_id allocations; mixed target types are rejected. unattributed, service_line_by_id, claim_by_encounter_external_id, billing_provider_by_id, and malformed targets are unsupported. Claim and appointment payments require 1–25 positive allocations, a verified financial patient MRN, and exactly one in-scope billing_provider_npi allocation restriction; any service_facility_id restriction must also be in scope. Each claim must match both the patient and restricted NPI; every appointment must belong to the patient. For claim and appointment payments, unknown fields and invalid scope or target proofs are refused with 403 before creating a payment. See Creating patient payments for requirements and a minimal request.