API Integration Specialist Needed

I'm looking for an experienced developer to integrate a bank transfer payment method and at least one third-party service into my existing system.

Key Requirements:
- Integrate bank transfer payment method
- Integrate at least one third-party service (CRM, Accounting Software, or Email Marketing)
- Ensure secure and efficient data transfer between systems
- Provide documentation for the integration

Ideal Skills and Experience:
- Proven experience in API integration
- Strong knowledge of payment processing, especially bank transfers
- Familiarity with various third-party services
- Good documentation skills
- Problem-solving and troubleshooting abilities

Please include examples of similar work done.