Follow the procedure in the Google Pay documentation to integrate your web or Android application.
In the step where you choose a payment tokenization method, choose Gateway, then set comcarde as your gateway. If you have not been provided with a gatewayMerchantId parameter, please raise a ticket with support on the BR-DGE Support Portal at https://docs.br-dge.io/docs/support#contact-support.
The BR-DGE SDK can optionally be used to automate client side interactions with the Google Pay™ API. The SDK will output a nonce that you can directly use.
For more information please refer to the Google Pay Feature page.