API Integration and Logging Development

I need a developer to connect our system to an API gateway. You will update our existing file (montransfer.php) and create a log file for transaction status.

Requirements:
- Update montransfer.php to connect to API and send instructions to gateway
- Create a log file button on montransfer.php for status reports (success, failed, etc.)
- Test on API gateway sandbox and provide test results

Ideal skills and experience:
- Proficient in PHP
- Experience with API integration
- Familiarity with creating log files and status reports
- Ability to test and validate in a sandbox environment

Please ensure you have access to the API documentation.