Looking for a Shopify Plugin/checkout developer

I have an inventory Laravel website. I have several partners who have stores on Shopify. So I want when users checkout, they will be able to see the option to checkout via my Inventory store too (only if that product is available in my inventory). If they click on it, it will take them to my Laravel site.
Please provide me a consultation on how will you achieve it and then I will hire you.

Note: In your proposal write "I am an expert developer"