paystack-verify.js

app.get('/payment/verify', async(req,res) => {  
 
 const ref = req.query.reference;
let output;
await axios.get(`https://api.paystack.co/transaction/verify/${ref}`,    {
   headers: {
   authorization: "Bearer TEST SECRET KEY",
//replace TEST SECRET KEY with your actual test secret 
//key from paystack
   "content-type": "application/json",
   "cache-control": "no-cache",
},
).then((success)=>{
output=success;
}).catch((error)=>{
output=error;
});
//now we check for internet connectivity issues
if(!output.response && output.status!==200) throw new UserInputError("No internet Connection");
//next,we confirm that there was no error in verification.
   if(output.response && !output.response.data.status) throw new       UserInputError( "Error verifying payment , 'unknown Transaction    Reference Id'");
  
   }
//we return the output of the transaction
   res.status(200).send("Payment was successfully verified");
 }