Urgent Node.js Backend Customization

I have a full Node.js backend code and need an expert to integrate a payment gateway and some small features within 1 day.

Requirements:
- Integrate a payment gateway (specifics to be discussed)
- Implement small features related to user authentication, API enhancements, and admin dashboard updates

Ideal Skills and Experience:
- Node.js expertise
- Experience with payment gateway integration
- Familiarity with user authentication, API enhancements, and admin dashboard updates
- Ability to deliver high-quality work under tight deadlines