Submit order

Where this sits

Submit a fiat amount and network; the response returns this order’s cryptoAmount and payUrl. Pay this data.cryptoAmount.

POST/api/public/order/apply

Content-Type: application/json

Request parameters

Field	Type	Required	Sign	Example	Description
`appId`	string(12-16)	Yes	Yes	`k-mch8x2k1p4q9`	APP ID
`merchantOrderNo`	string(5-32)	Yes	Yes	`ORD-20260822-0001`	Merchant order no, unique on the merchant side
`network`	string	Yes	Yes	`TRC`	Network, see Parameter lookup
`asset`	string	Yes	Yes	`USDT`	Collection asset; TRC currently supports USDT only. See Parameter lookup
`amount`	string	Yes	Yes	`10.99`	Fiat amount
`currency`	string(3)	Yes	Yes	`USD`	Fiat ISO code; see Parameter lookup
`notifyUrl`	string	Yes	Yes	`https://merchant.example.com/ucashier/notify`	Publicly reachable callback URL
`attach`	string	No	No	—	Echoed on callback
`redirectUrl`	string	No	No	`https://merchant.example.com/orders/thank-you`	Front-end redirect after payment
`signature`	string(32)	Yes	No	`07BA8514788F143D2437E0D6F4C028D0`	Signature, see algorithm

Response data fields

Field	Type	Description
`appId`	string	APP ID
`orderNo`	string	Platform order no
`merchantOrderNo`	string	Merchant order no
`exchangeRate`	string	Exchange rate returned by the API
`asset`	string	Order asset; see Parameter lookup
`cryptoAmount`	string	Final amount due; see asset for the coin. Authoritative for payment
`status`	string	Order status; see Parameter lookup
`payUrl`	string	Cashier URL

Request example

{
  "appId": "k-mch8x2k1p4q9",
  "merchantOrderNo": "ORD-20260822-0001",
  "network": "TRC",
  "asset": "USDT",
  "amount": "10.99",
  "currency": "USD",
  "notifyUrl": "https://merchant.example.com/ucashier/notify",
  "redirectUrl": "https://merchant.example.com/orders/thank-you",
  "attach": "custom",
  "signature": "07BA8514788F143D2437E0D6F4C028D0"
}

Response example

{
  "code": "100000",
  "message": "Success",
  "data": {
    "appId": "k-mch8x2k1p4q9",
    "orderNo": "U260830162530123456",
    "merchantOrderNo": "ORD-20260822-0001",
    "exchangeRate": "1.0000",
    "asset": "USDT",
    "cryptoAmount": "10.99",
    "status": "pending",
    "payUrl": "https://pay.ucashier.ink/#/payment/order?..."
  },
  "requestId": "..."
}