Our products can vary by Imprint methods, Size, Color, Flavor. Currently, 29 products have more than 100 variations. And there are more and more such products. Since Shopify has 100 variants limit for a product, we had to create a complex structure for such products: create separate products for color variants, size variants, Imprint variants and then link them using metafields.
Our pricing calculation is complicated as well. It's based on such price components as Unit price matrix (where Unit price depends on quantity), Add-on price, Up-charge/Down-charge on specific product variations, Fees (if the customer selects specific Imprint color, adds an image etc), Promo Codes and Shipping&Handling Fees. Since Shopify's out-of-box functionality doesn't meet our needs, we're developing a custom application to implement the required pricing logic.
Request
We need to transmit the prices calculated in the backend of the custom application to the backend of the shopping cart and checkout in a secure way. (Note: transmission from the frontend of the custom application is not secured)
This custom calculation should be the base for further reorder functionality. It means that when reordering the customer must be redirected to the Cart prefilled with the prices calculated in the custom application.
