Prestashop checkout doesnot accept payment from Gateways

I am looking for a freelancer who can help me with my Prestashop checkout. Currently, I am having issues with payment not going through when using Stripe, Braintree and Paypal as my payment gateway. Only option to checkout is with a paypal account. I am unsure if this is a custom integration or a plugin/module issue.

Ideal Skills and Experience:
- Experience with Prestashop and payment gateway integrations
- Knowledge of payment gateway
- Ability to troubleshoot and identify issues with checkout process

If you are interested in this project, please provide your experience and approach to resolving this issue. Thank you.