Generating checkout link for Direct checkout flow

• Use provided checkout domain with https scheme
  for example: https://pay.trdworld.com
• Add /pay uri
  https://pay.trdworld.com/pay
• Add query params with payment details

Parameter	Mandatory	Description	Example
merchant_identifier	Required	Merchant id provided upon integration	1099
api_key	Required	API key provided upon integration	02e1fe3b-b91e-43f7-a030-58b9b785a2b3
merchant_order_id	Required	Unique payment id from your system	ORD_CL_773460010
payment_method_type	Optional	Code for payment method preselected by customer	BT_AR
amount	Required	Amount for payment. Minor currency units	25000
currency	Required	Currency code for payment	ARS
customer.id	Required	Unique customer id from your system	cust_3245242
customer.name	Optional	Customer name	John Dow
customer.email	Optional	Customer's email	john.dow@gmail.com
customer.phone	Optional	Customer's phone number	+919876543210
customer.lang	Optional	Language code for customer checkout	en es hi ar
customer.kyc_level	Optional	'TRUSTED' for verified customers	en es hi ar
callback_url	Optional	Url for webhook notification. You can use unique url for each payment if needed	https://merchant.com/webhook https://merchant.com/webhook/ORD_CL_773460010
return_url	Optional	Url to return customer upon payment has been completed	https://merchant.com/payment/return

https://pay.trdworld.com/pay?amount=250000&currency=ARS&merchant_order_id=ORD_CL_773460010&customer.id=cust_635001&customer.name=John%20Dow&customer.email=john.dow%40gmail.com&customer.lang=en&payment_method_type=BT_AR&return_url=https%3A%2F%2Fmerchant.com%2Fpayment%2Freturn&callback_url=https%3A%2F%2Fmerchant.com%2Fwebhook%2FORD_CL_773460010&merchant_identifier=1099&api_key=02e1fe3b-b91e-43f7-a030-58b9b785a2b3

• Calculate signature

  • Use generated url with query params as string to sign and calculate hash using HMAC-SHA256 algo with secret_key provided upon integration
  • Add parameter signature with hexadecimal calculated hash

• Redirect customer to signed url

https://pay.trdworld.com/pay?amount=250000&currency=ARS&merchant_order_id=ORD_CL_773460010&customer.id=cust_635001&customer.name=John%20Dow&customer.email=john.dow%40gmail.com&customer.lang=en&payment_method_type=BT_AR&return_url=https%3A%2F%2Fmerchant.com%2Fpayment%2Freturn&callback_url=https%3A%2F%2Fmerchant.com%2Fwebhook%2FORD_CL_773460010&merchant_identifier=1099&api_key=02e1fe3b-b91e-43f7-a030-58b9b785a2b3&signature=ba93267add47b4358f6d4059db35efe73be236313222f20415fb7dea527d5afc