How do i handle url callbacks on my serverless flutter app? - flutter

Question

I am testing a crypto payment system on my flutter app, and after generating a random address for payment, the api is supposed to notify me when the transaction has been confirmed using a callback url. I use firestore for my backend, how do i handle this callback url. I will post a copy of the documentation below.
"Insert your URL address where you want to get callbacks in create_payment request. The parameter name is ipn_callback_url. You will receive payment updates (statuses) to this URL address."

Answer 1

for anyone having a similar challenge, i actually solved this problem by writing a http cloud function to help me handle this, then supplied the url to the function as the callback url to the api. SO yes.... http cloud functions was a solution to this problem
Here's a very simple function that can be used:
exports.paymentConfirmation = functions.https.onRequest(async(req, res)=>{
const requestBody = req.body;
const paymentStatus = requestBody.payment_status;
console.log('this is the payment status: ' + paymentStatus);
Promise.resolve();
}
res.send(null);
})
basically you can do anything you want with the request body you get back. In this case i just logged one of the parameters. After deploying this function to firebase, you have access to its url. Problem solved. So when there's an update from the api u subscribed to, it can send a POST request to that url and that triggers whatever code you've written in the function.