Integrate Referral Program with Custom PHP Site

I'm looking for an experienced developer to integrate referral program software with my custom-built PHP/Laravel website.

Requirements:
- Seamless integration with existing website
- Ensure security and data integrity
- Provide documentation for maintenance

Ideal Skills:
- Proficiency in PHP/Laravel
- Experience with referral program software
- Strong problem-solving skills
- Familiarity with web security best practices

Please provide examples of similar work done.

The software is from easyaffiliate, it is already installed. I have own system with paypal ipn integration it needs to work with easyaffiliate.