Script to fill out the form by api-request (in PHP jQuery)

A small script is required to populate the client data via TIN through an api request to the server in json format. The script is part of a self-written CRM system.
Must be implemented in PHP jQuery.

Attached is the terms of reference and template of the script file test_api.php.
A detailed description of the service that provides a response to json, with the formats of requests and responses, will be provided to the contractor after the approval of the Contractors candidacy.

Term: up to 3 days.

In the answer, be sure to indicate your price and terms. Payment through the BS or directly to the executor.
Thank you.