Android Purchases Code
Please be mindful. This page is almost identical to the previous with exceptions in the function name and code.
These codes will allow you to acknowledge and verify purchases or subscriptions. There is 1 call for each type of transaction.
2. Click Create Function
3. Give your new function a meaningful name
androidPurchaseHandler should be the name you use here
4. Save the trigger type
5. Copy the code below and click the blue "next" button
Copy Me
///purchase handler
const functions = require("firebase-functions");
const admin = require("firebase-admin");
const googleServiceAccountKey = require("./serviceAccount.json");
admin.initializeApp({
credential: admin.credential.cert(googleServiceAccountKey),
});
const {google} = require("googleapis");
const axios = require("axios");
exports.androidPurchaseHandler = functions.https.onRequest((request, response) => {
const {purchaseObject, type} = request.body;
// get the token and product id from the request
const purchaseToken = purchaseObject.purchaseToken;
const productId = purchaseObject.productId;
functions.logger.info(`trying to handle ${type} for the follow ${JSON.stringify(purchaseObject)}`);
// set your package id
const packageID = "edu.fit.my.jgibb2018.pob";
const returnTheResponse = (data) => {
response.status(200).send(data);
};
const acknowledgePurchase = (err, tokens) => {
functions.logger.info("acknowledging purchase");
const config = {
method: "post",
url: `https://androidpublisher.googleapis.com/androidpublisher/v3/applications/${packageID}/purchases/products/${productId}/tokens/${purchaseToken}:acknowledge`,
headers: {
"Authorization": `Bearer ${tokens.access_token}`,
},
};
axios(config)
.then(function(r) {
functions.logger.info("acknowledge success. returning ", JSON.stringify(r.data));
returnTheResponse(r.data);
})
.catch(function(e) {
returnTheResponse(JSON.stringify({error: e.data, status: e.status, message: e.message}));
});
};
const verifyPurchase = (err, tokens) => {
functions.logger.info("verifying purchase");
const config = {
method: "get",
url: `https://androidpublisher.googleapis.com/androidpublisher/v3/applications/${packageID}/purchases/products/${productId}/tokens/${purchaseToken}`,
headers: {
"Authorization": `Bearer ${tokens.access_token}`,
},
};
axios(config)
.then(function(r) {
functions.logger.info("verify success. returning ", JSON.stringify(r.data));
returnTheResponse(r.data);
})
.catch(function(e) {
returnTheResponse(JSON.stringify({error: e.data, status: e.status, message: e.message}));
});
};
const getAccessToken = () => {
const jwtClient = new google.auth.JWT(
googleServiceAccountKey.client_email,
null,
googleServiceAccountKey.private_key,
["https://www.googleapis.com/auth/androidpublisher"],
null,
);
try {
functions.logger.info("type is ", type);
if (type == "purchaseAcknowledge") {
jwtClient.authorize(acknowledgePurchase);
} else {
jwtClient.authorize(verifyPurchase);
}
} catch (error) {
functions.logger.log(error);
response.status(500).send("getting auth", error);
}
};
getAccessToken();
});
6. Clear the default and paste the copied code into the code
7. Update the package.json file
copy and paste this over the default code
{
"name": "sample-http",
"version": "0.0.1",
"dependencies": {
"axios": "^0.26.0",
"googleapis": "^97.0.0",
"firebase-functions": "^3.18.0",
"firebase-admin": "^10.0.2"
}
}
8. Set the name of the functions entry point
the name used here should match the name used in Step 3 above
9. Click the plus icon to create a new file and name it "serviceAccount.json"
11. Deploy the function
12. Set function invocation privacy permissions
This allows any device with your endpoint URL the ability to verify purchases made via your app
Select the function you want to make public. (the function you just created)
Click the Permissions tab.
In the Add members field, type allUsers
Select the Cloud Function Invoker role from the Select a role drop-down menu.