title: Specifying google pay tokenization
body: <p>I am trying to implement google pay for the first time. I am having a challenge of how to specify the the <code>gateway</code> and <code>gatewayMarchantId</code>. 
  What I have is google console a account and don't know where to find this information.</p>
  
  <pre><code>private static JSONObject getTokenizationSpecification() throws JSONException {
      JSONObject tokenizationSpecification = new JSONObject();
      tokenizationSpecification.put("type", "PAYMENT_GATEWAY");
      tokenizationSpecification.put(
              "parameters",
              new JSONObject()
                      .put("gateway", "example")
                      .put("gatewayMerchantId", "exampleGatewayMerchantId"));
  
      return tokenizationSpecification;
  }
  </code></pre>
  
  <p>what do I replace <code>example</code> and <code>gatewayMerchantId</code> with for my payment to work?</p>