Paypal Integration for Custom PHP Site

I need Paypal Checkout integration with "Pay Later" options for my custom-built PHP website. I also need assistance to fully set up my business Paypal account.

Ideal Skills and Experience:
- Strong experience with Paypal APIs
- Proficiency in PHP and custom-built websites
- Familiarity with payment gateways and checkout processes
- Experience in setting up and configuring Paypal business accounts

Please provide examples of similar work done.