App to allow customers to pay for a monthly subscription and get x% topup on the subscribed amount

[arpconsulting]

Hi,

I would like to add an option for customers to choose a monthly subscription plan (let's say 100 ron) and as soon as they pay, we top up their account with +10% (they pay 100 ron and they get 110 ron in their account). 

Any idea if there is such an app within Shopify?

Thank you,

Raluca