By default the hash key is not enabled. To obtain a hash key you will need to contact firstname.lastname@example.org with your Seller ID (also known as a Terminal ID).
Keep in mind that there will be one hash key provided for testing, and a separate one must be requested for live.
If you are requesting a hash key for the live platform, please note that as soon as the hash key is enabled, the payments will cease to work without the necessary coding to include a hash key/code. We advise testing your implementation on the test platform first.
There is more information on how to generate the hash code in C# and in PHP in the Integration Guide, available at the following:
For more information on what a hash key and a hash code are, please see "What is a Hash Key and Hash Code"