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- make a request to connect TokenPay payment processing service functionality to the IPS Assist technical support service support@assist.ru;
- implement in your app the support for payment of orders with a token, using the Assist SDK, Google Pay API along with access to TokenPay service;
- obtain confirmation from the IPS Assist technical support service that all the necessary technical settings for the functioning of the TokenPay payment processing service when paying for goods and services to your merchant have been fulfilled;
- prepare for receiving payments - to organize the encryption scheme of the data packet with the token, you must use the public key Public Key: 'BElVf3z1PE68riWbP0YRp4vC+0MuNbd6pqVAe1uHBHYGJvzZonlkVAp5CEEp2EEUswS7hS1y0RyNB3SR2FVExDQ=' and merchant ID MerchantID:'16590966430175452581 you should register with Google Pay API to get a MerchantID for use it as MerchantID parameter, set gateway=”assist” and specify allowedCardAuthMethods = ["CRYPTOGRAM_3DS"] to organize the scheme for encrypting a data packet with a token or allowedCardAuthMethods = ["PAN_ONLY", "CRYPTOGRAM_3DS"], if you also need to accept payments with non tokenized cards that saved in Google account.