Can I use Shopify's cart and checkout process without storing my product inventory to shopify?

Topic summary

Seeks to use Shopify’s cart and checkout purely for payment processing without storing products in Shopify. The poster maintains a custom product inventory in a MySQL database and wants to avoid duplicating product data in Shopify’s catalog.

Asks if Shopify’s APIs allow initiating checkout by passing product details (e.g., productId, price, and related info) so Shopify can complete the transaction. Essentially, they want Shopify to handle the cart/checkout flow while product data lives externally.

No responses provided yet; no technical confirmation, alternatives, or constraints discussed. No code snippets, images, or attachments are involved. Status: unanswered and open, with key question about feasibility of checkout without Shopify-stored products remaining unresolved.

Summarized with AI on December 28. AI used: gpt-5.

Hey all,

I currently have my own custom product inventory in a mysql database. I want to ask whether I can use Shopify’s cart and checkout process without storing any product to shopify?

ie is it possible using the Shopify integration API to pass productId and price and any other info so that it completes the money transaction?

Thanks