Please help with Google in app payments

[William H Taylor]

I am new to java programming. I am trying to implement a java servlet that processes google in app payments. I am trying to work my way through the code snippet that they provided. The code they have verbatim is below. My first question is how do I set up the servlet? Do I put a call in the doPost method of the servlet? If I leave it outside, the container wont call it right? What calls the getJWT() method? Third what do I do with the String that the method returns?

Here is the getting started page: https://developers.google.com/in-app-payments/docs/tutorial

private String getJWT() throws InvalidKeyException, SignatureException {
  JsonToken token = null;
  token = createToken();
  return token.serializeAndSign();
}

private JsonToken createToken() throws InvalidKeyException{
  //Current time and signing algorithm
  Calendar cal = Calendar.getInstance();
  HmacSHA256Signer signer = new HmacSHA256Signer(ISSUER, null, SIGNING_KEY.getBytes());

  //Configure JSON token
  JsonToken token = new JsonToken(signer);
  token.setAudience("Google");
  token.setParam("typ", "google/payments/inapp/item/v1");
  token.setIssuedAt(new Instant(cal.getTimeInMillis()));
  token.setExpiration(new Instant(cal.getTimeInMillis() + 60000L));

  //Configure request object
  JsonObject request = new JsonObject();
  request.addProperty("name", "Piece of Cake");
  request.addProperty("description", "Virtual chocolate cake to fill your virtual tummy");
  request.addProperty("price", "10.50");
  request.addProperty("currencyCode", "USD");
  request.addProperty("sellerData", "user_id:1224245,offer_code:3098576987,affiliate:aksdfbovu9j");

  JsonObject payload = token.getPayloadAsJsonObject();
  payload.add("request", request);

  return token;
}

[William P O'Sullivan]

Hello William, Welcome.

These are both private methods so I'm not sure what is missing.

I don't have time to go through your provided link, but they obviously have to get called from somewhere.

WP