Looking for shopify developer with api integration

I am looking for a Shopify developer with experience in API integration.
Specifically, I require the integration of a payment gateway, with a preference for PayPal.
In addition to the API integration, I also require the implementation of a user registration feature.
Ideal skills and experience for this job include:
- Proficiency in Shopify development
- Strong knowledge of API integration
- Experience with PayPal payment gateway integration
- Ability to implement user registration functionality
- Attention to detail and ability to meet deadlines.