Node.js Payment Gateway Integration

I'm looking for a seasoned freelancer who holds considerable experience in payment integration in Node.js. The specific gateway for integration is yet to be decided, but I'm open to suggestions from the professional.

Your application should demonstrate:

- Direct expertise in payment integration projects
- Familiarity with popular payment gateways
- Proven capability in Node.js

Please include your experience in detail so that I can understand your suitability for the task at hand. I look forward to your insightful proposal!