invoide id is empty

[AhmedMZaki]

i send my client to payment end point successfully but when the payment comeback it return invoice id is #0

next
i used the var_dump($params['invoiceid']); to seed the result of the request i send to the payment endpoint the problem is that the params array does not have the invoice id why is that ????

https://drive.google.com/file/d/16FRTaG_3PQDs9k7xDnaX9AeHb71ZjlWr/view?usp=sharing, https://drive.google.com/file/d/1EyPeYRTinuENszDq2iuIEMfB2XeqIJgM/view?usp=sharing