Shopify Integration with Online Diamond Catalogue

Hello,

We're looking for someone to help up integrate an online wholesale diamond catalogue with our premium Shopify theme

The wholesale website: Stuller.com
It's API documention: https://www.stuller.com/ecommerce-api-documentation/
Our website: icelabgems.com

You'll see that our site is just a reflection of the Stuller catalogue, this is because it's using IFrames

WHAT WE WANT:

-For our site to look and feel like https://www.brilliantearth.com/en-ca/ or something similar
-To have access to the Stuller catalogue with Shopify's functionality
-A shopping cart
-A custommer service chat box
-For the site to update it's inventory based on Stuller

SOME THINGS TO NOTE:

-Shopify has a payment integration system
-We'll be based in Canada and the States for the only currency to worry about for now is U.S and CAD
The amount of categories are similar to the ones found on our IFrame website.

The flexible budget is to accomodate a variety of results, from having just the IFrame with Shopify to a much prettier and professional site.