Unsuccessfull payment transfer using Paypal with nodejs - node.js

Question

I am trying to implement the Paypal gateway method in nodejs. I am successful redirecting to paypal from my nodejs and when I click on pay I get "Error": "Response Status : 400", with an unsuccessful payment.
My API and its response are given below in detail.
paypal.configure({
'mode': 'sandbox', //sandbox or live
'client_id': 'ATXsRtel_YoAQHVIwP4Z_bmX3VkL1n1N_fJ6FH2os0GynozBJo-Oler8wFVvXzoPpNwbfCAYFvCL76Ke',
'client_secret': 'EAwUmjDRpC-fqz_Fcs262MKrdMDltXJnWiA-
N6gURWcJq1N9IpwzISfcCMLNHzXFJ_38YLQXG3jtUK8a'
});
Post Api for req.body and get the url back
Router.post('/Pay',(req,res)=>{
const create_payment_json = {
"intent": "sale",
"payer": {
"payment_method": "paypal"
},
"redirect_urls": {
"return_url": "http://localhost:7070/PayPal/PaymentSuccess",
"cancel_url": "http://localhost:7070/PayPal/PaymentCancel"
},
"transactions": [{
"item_list": {
"items": [{
"name": "ball",
"sku": "001",
"price": "25.00",
"currency": "USD",
"quantity": 1
}]
},
"amount": {
"currency": "USD",
"total": "25.00"
},
"description": "Testing Product"
}]
};
paypal.payment.create(create_payment_json, function (error, payment) {
if (error) {
res.json({
Message:'Un Approved',
Error:error.message
})
} else {
payment.links.map(_AllLinks=>{
if(_AllLinks.rel === 'approval_url'){
res.json({
Message:'Approved',
Url:_AllLinks.href
})
}
})
}
});
})
Rout to get payerID
Router.get('/PaymentSuccess',(req,res)=>{
let payerId = req.query.PayerID;
let paymentId = req.query.paymentId;
console.log({
payerId:payerId,
paymentId:paymentId
});
let execute_payment_json = {
"payer_id" : payerId,
"transaction" : [{
"amount":{
"currency":"USD",
"total":"25.00"
}
}]
}
paypal.payment.execute(paymentId,execute_payment_json, function(error,payment){
if(error){
res.json({
Error:error.message,
Message:error
})
}else {
res.json({
Result:payment
})
}
})
})
Router.get('/PaymentCancel',(req,res)=>{
res.json({
Result:'Cancelled'
})
})
The response i get and my payment got unsuccessful.
// 20210504063330
// http://localhost:7070/PayPal/PaymentSuccess?paymentId=PAYID-MCIKIRQ60G27157PA787072M&token=EC-
9EU01414K39004833&PayerID=GFYGLAXW36YPW
{
"Error": "Response Status : 400",
"Message": {
"response": {
"name": "VALIDATION_ERROR",
"message": "Invalid request - see details",
"debug_id": "cfeb4eab621c7",
"details": [
{
"field": "/transaction",
"location": "body",
"issue": "MALFORMED_REQUEST_JSON"
}
],
"links": [
],
"httpStatusCode": 400
},
"httpStatusCode": 400
}
}

Answer 1

The v1/payments REST API is deprecated. Use the current v2/checkout/orders API instead.
The best integration uses no redirects, and keeps your site loaded in the background with an in-context approval.
Make two routes on your server, one for 'Create Order' and one for 'Capture Order', documented here. These routes should return only JSON data (no HTML or text). The latter one should (on success) store the payment details in your database before it does the return (particularly purchase_units[0].payments.captures[0].id, the PayPal transaction ID)
Pair those two routes with the following approval flow: https://developer.paypal.com/demo/checkout/#/pattern/server