I'm looking for the way to generate authentication key specific to each Gateway? Is it possible, then how?
Yes for sure, you just need to create it with the corresponding snippet CreateApplicationKey .
Thank you, Carles.
But Application Key is created with respect to each user. How will it be unique for each Gateway? I can use same Application Key for all Gateways.
You can use same AppKey for all the Gateways, or you can create one AppKey different for each Gateway, all binded to the same user or create a user/appkey pair for each gateway.