So when you are talking about ONLINE-STORE you surely use Wix-Stores, right?
Meanwhile you can do a lot of things on wix-stores with the wix-stores-API.
https://www.wix.com/velo/reference/wix-stores-backend
So i would suggest you to take a look there first. Perhaps you will find your solution on your own. And if you have issues, just post the issue here into the forum. And when at the end, you still are thinking of engage an devoloper i would reccomend you for example —> J.D. or Ahmad. You will find them here at forum. Of course there are also some more forum users here which could surely help you to realize your wishes, like —> GiriZano, Certified Code - Velo Certified. Perhaps even Yisrael can do the service for you (if he has enough free-time).
I myself do not use Wix-Stores, because of this i am not very familiar with it and all it’s functions. Perhaps in future, i will also be able to help in at this part.
You can tag any user with a —@ infront of his name, to let them know, of your message.
Good luck.