Upload a file for KYC verification. Send as multipart/form-data with a ‘file’ field and ‘purpose’ field.
Partner API key (sk_live_* for production, sk_test_* for sandbox)
File uploaded
File ID
"file_abc123"
Original file name
"passport_front.jpg"
File size in bytes
204800
File purpose
kyc_id_front, kyc_face_photo, kyc_address_proof, kyc_asset_proof ISO 8601 creation timestamp
"2026-03-20T14:30:00Z"