Promo Code Discount Not Showing In My Site After Purchasing Via Paypal

Hello Guys ,

When someone pays by credit card on my site, the discount does show up on the invoice and are charged accordingly. Can someone look into how to get the invoices on our site to reflect a promo code when using PayPal services by customers ?

But one thing i like to add, paypal does charged accordingly, only in my site the discount value and pdf details are wrong (i.e without discount value).

Please help me.

Thank you