Payment not working for TAMU !!!

Please help me. I am applying to Texas A&M University. I completed all the steps in engineering CAS. But when paying the 25 dollars, they won’t accept the payment.

I have sufficient money. I have provided the right information. I tried with multiple billing addresses as well. And I have also paid 100 dollars in other universities and it worked just fine.

What could be the case? Other universities seem to be fine when taking the payment.