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This method creates a payments client, checks if Google Pay is ready, and sets up the payment gateway parameters.

In the tokenizationSpecification, use ‘exampleGatewayMerchantId’ until you go into production with your merchant id.

tokenizationSpecification = {
  type: 'PAYMENT_GATEWAY',
  parameters: {
    'gateway': 'payway',
    'gatewayMerchantId': 'exampleGatewayMerchantId'
  }