To run this code to test it you can use the wp-cli tool with the eval-file command. wp-cli eval-file loads up the whole WordPress infrastructure then runs your PHP file so you can use WordPress calls like wp_remote_request without having to put this code in a page or pulgin. E.g. write a file called test.php that instantiates the class and calls the methods, then run that with:
wp-cli eval-file test.php
I see that @rudtek has answered how to get the data from the shortcode into your code.
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