Online credit card payment - wrong currency on order page

Job ID: 33438364

Budget: $20 – $35 USD

After integration of the one EU online payment system, after the payment system redirects from the order page to the credit card payment page it shows the wrong currency.
We have next:
a) Full manual for building per credit card company instructions
b) Detailed list of created files from the company that created and integrated this payment system
NOTICE: website is live so we need to be careful!
Related categories: PHP Payment Gateway Integration