Preload Credit for a Shopper

[dogmansa]

Hi

I am using Joomla 3.7.4 VM 3.2.2

My client has requested that he be able to preload a credit amount onto a shoppers account. Shopper can then use this against his purchases on the store.

Is this possible? I can't locate any third party extensions and can't find anything in the documentation. Any search using the term credit just brings up Credit Cards.

I would appreciate any assistance

thanks