Collect the card data from your UI and construct a CardBuilder with it. You can then tokenize that to get a nonce that can be sent to your server:

Java
CardBuilder cardBuilder = new CardBuilder()
  .cardNumber("4111111111111111")
  .expirationDate("09/2018");

Card.tokenize(mBraintreeFragment, cardBuilder);

You'll need to register a listener to receive a payment method nonce once the Android Pay flow finishes.

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