Hello, I am about to launch our new online fashion store, targeting customers from African countries. As most customers from these countries uses their mobile money account with various phone carriers, when paying for their purchase, so I got one of my partners to open a merchant account. We will be receiving the API certificates any day, and I would like to know how to add these certificates to our payment gateway. I cannot find any clear instructions on how to do this, so is there anybody out there that can help me. I appreciate any advice.