Integrate Square Payments Correctly on wordpress website

My business site already has a payment module in place, but it was set up incorrectly and transactions fail to process. I need someone to cleanly integrate Square as the sole gateway so we can start taking payments without hiccups. We will be accepting Credit/Debit Cards and Bank Transfers through Square, and I also need the recurring billing features enabled for subscription products.

Your job is to remove or repair the faulty configuration, connect the new Square credentials, and confirm that the checkout flow is smooth on both desktop and mobile. A successful outcome means customers can complete one-time purchases and enroll in subscriptions without errors, and all transactions report properly in the Square dashboard and in our site’s order records.

Deliverables:
• Fully functional Square integration supporting card and bank-transfer payments
• Recurring billing / subscription capability activated and tested
• End-to-end test transactions with proof (screenshots or screencast)
• Brief hand-off notes summarizing what was changed and how to update keys in the future

I’m ready to provide current site access and Square API keys as soon as we agree on the approach.