Writing a script in PHP

The services of a web programmer are required. You need to write a script in PHP working with the API of a remote web service.
- Data import from CSV
Authorization on a remote service through API
- Transmits requests to a remote service (line by line from the array)
- Getting an answer.
- Interpreting.
- Uploading the received data to the CSV

Design Requirement: Download file selection manager, 2 flags, Receive button, file saving manager