Payment notification

Payment callback (Payment notification) will be sent to merchant's callbackUrl

Callback data is sent in POST method.

Notification scheme:

Name	Value
orderId	Invoice number
created	Invoice creation time.
status	Transaction status
amount	Invoice amount
currency	Invoice payment currency
payAmount	The amount of cryptocurrency paid by the buyer.
payCurrency	The cryptocurrency in which the payment was made; for example, BTC, LTC, ETH.
underpaidAmount	The amount of cryptocurrency (payCurrency) underpaid by the buyer; for example, if payAmount => 1 , payCurrency => ETH, and the buyer paid 0.1 ETH, then underpaidAmount => 0.9. Changes in underpaidAmount will not cause additional callbacks, but when order information is retrieved via GET/v2/merchant/Merchant/transactions, the latter value will be shown.
overpaidAmount	The amount of cryptocurrency (defined by pay_currency) overpaid by the buyer; for example, if payAmount => 0.123, payCurrency => ETH, and the buyer paid 0.15 ETH, overpaidAmount => 0.027. Changes in overpaidAmount will not cause additional callbacks, but when order information is retrieved using GET/v2/merchant/Merchant/transactions, the latter value will be shown.
token	Token (or generated by payment system) to confirm payment callback.

Retry time (called on response other than 200)

• Sending every 1 minute if the number of retries <= 40

• Callback will be cancelled if the number of retries >= 41

After sending the payment notification, the system(backend) waits for a response for 20 seconds. The payment notification will be canceled and terminated if any of the following conditions occur:

• The payment notification is sent 40 times.

• After the payment notification is sent, a response status of 301, 302 (redirect) is received. Usually this happens if you use "http" in the URL and it is redirected to "https".

• A 401 (unauthorized) response status is received after sending a payment notification.

• This usually happens if your site is password protected (basic access authentication).

• Make sure your site is in the public domain.

• A payment notification is sent to the TOR network. The payment notification is sent to a private network, such as localhost.