This script was made to assist you with simulating INS messages on demo sales.
Because 2Checkout does not send INS message on demo sales and the INS simulator does not use your sale data that you application will be looking for.
The return.php script works by taking the parameters sent to the approved URL and converting the values to the appropriate INS parameters. The INS array is then saved in a JSON file and retrieved by the testing tool. The original return parameters are then forwarded to your approved URL by GET or POST based on the return method that the you used.
The test.php script retrieves the JSON, takes secret word so that the the MD5 hash can be computed correctly and adds the fields to an HTML form so that you can edit the values if necessary for specific test cases. You can then POST the parameters to your INS URL through the form or using cURL if you prefer by selecting cURL as the return type.
To use, just download or clone, upload to your server and on your 2Checkout Site Management page set the approved URL to point to the included response.php file.
Please note that the the 2Checkout approved URL passback returns different data for different parameters sets so while I tried to get everything as close as possible, you may need to amend some parameter values that are not returned.
2Checkout INS Documentation https://www.2checkout.com/static/va/documentation/INS/index.html