How to get public key in Google pay integration with Direct token specification approach

Question

I am trying to integrate google pay in my android app. I want to integrate google pay without any payment gateway in between (means DIRECT approach rather than PAYMENT_GATWAY token specification). I found DIRECT method integration code on official site. In that google asks for protocolVersion and publicKey as parameter and below i found that i can get my public key in my Google Pay Developer Profile. I searched for Google Pay Developer account but unable to found public key Anyone can help me to get public key for google pay DIRECT integration?

private static JSONObject getTokenizationSpecification() {
  JSONObject tokenizationSpecification = new JSONObject();
  tokenizationSpecification.put("type", "DIRECT");
  tokenizationSpecification.put(
      "parameters",
      new JSONObject()
          .put("protocolVersion", "ECv2")
          .put("publicKey", "replace with public_key"));

  return tokenizationSpecification;
}

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Soc Soc · Accepted Answer · 2019-10-30T23:32:52

You can refer to an answer that I provided to the following question: Where is Google pay Developer account and how to generate public key to upload in it?

Adding a public key to your Google Pay Developer Profile:

The public key needs to be added to both the Google Pay Developer Profile and included as part of the payment request: https://developers.google.com/pay/api/android/reference/request-objects#direct

Note that you need to be registered with Google Pay for DIRECT integration.

Example:
"tokenizationSpecification": {
  "type": "DIRECT",
  "parameters": {
    "protocolVersion": "ECv2",
    "publicKey": "BOdoXP1aiNp.....kh3JUhiSZKHYF2Y="
  }
}

Generating a public key:

The following link provides details on how to generate a public key using OpenSSL: https://developers.google.com/pay/api/android/guides/resources/payment-data-cryptography#using-openssl

Important bits:
# generate private key
openssl ecparam -name prime256v1 -genkey -noout -out key.pem

# generate a base64-encoded public key
openssl ec -in key.pem -pubout -text -noout 2> /dev/null | grep "pub:" -A5 | sed 1d | xxd -r -p | base64 | paste -sd "\0" -

How to get public key in Google pay integration with Direct token specification approach

1 Answers