WordPress Site PayPal Integration & Testing

I need a PayPal gateway added to both the checkout and cart pages of my WordPress website. This will be the first payment gateway integrated into the site. The PayPal integration will need to accommodate subscription payments. After the installation, I would like a thorough check to ensure the payment system is functioning correctly.

Ideal Skills:
- WordPress development
- PayPal gateway integration
- E-commerce expertise
- Troubleshooting and site testing

Experience with setting up subscription payments through PayPal is a plus.