Website payment is not working

I am currently experiencing payment issues with my e-commerce website. I have integrated a payment system that is not PayPal or Stripe. I am facing a problem with the payment system that is not specified as payment not going through or error messages at checkout.

Skills and experience needed for this project:
- Proficiency in e-commerce website development
- Experience with integrating and troubleshooting payment systems
- Knowledge of various payment gateways and their APIs