Configure ChatGPT with My REST API

I need assistance in integrating my REST API with ChatGPT. The integration should allow both data retrieval and submission. The API uses Basic Authentication, so the configuration should accommodate this as well.

Key Requirements:
- Expertise in configuring ChatGPT with REST APIs
- Proficiency in both data retrieval and submission via APIs
- Experience with Basic Authentication setup

Skills and Experience:
- Previous work with ChatGPT integrations
- Strong understanding of REST API functionalities
- Familiarity with Basic Authentication protocols

I need to call only 3 endpoints:
- get invoices by date and company taxid
- get transactions by month year and iban
- post new invoice