There is a payment system on my site.I agreed with an advertiser and he gave me a Facebook pixel id. I use this on the client side, it’s very easy , but in some cases I couldn’t figure out how to integrate this, for example in case of payment completion.The place where the payment takes place is firebase functions.

note : I was given only pixel id and script code.

offlinepayment in firebase function :

  app.post('/offlinepayment',  (req:any, res:any) => {
    var re =  new Promise((Resolve, Reject) => {
      return iyzipay.checkoutForm.retrieve({
        locale: Iyzipay.LOCALE.TR,
        conversationId: '*******',
        token: req.body.token
    }, function (err:any, result:any) {
      Resolve(result)

  });
    })
re.then(async (result:any)=>{
      if (result.paymentStatus = "SUCCESS") {
//I want to perform facebook pixel operation here