post https://sandbox.api.mxmerchant.com/checkout/v3/application
Create a new API key and secret for this merchant
Save Secret Key
The API secret key is only returned once at the time of creation. You will not be able to retrieve the secret key once the keys have been created, so please save the secret key when they API keys are created.
Developer App Required
The developer app needs to be activated prior to creating new API Keys.