I first tried paying with my GTBank Mastercard but it failed telling me it wasn't honored. I've contacted GTBank on how to resolve this and I'm waiting t hear from them.
If you want to upgrade your mad mimi account, sign in to your account and click on the "Go Pro" tab. Select the number of contacts you want and enter your card details to complete the transaction.
I didn't use token nor OTP to complete the transaction with my Access bank Visa ATM card.
Note: The mad mimi free plan lets you store 100 contacts and send out unlimited emails. You can sign up for your free account here.
About Mad Mimi
Mad Mimi is a simple lovely email marketing service. You can use it to create, send, share and track email newsletters.