Shopify APIs for self checkout system and POS

[YogeshWagh]

Hi,

We are a developer new to Shopify and we have two business cases that we would like to implement:

1. We have development self checkout system for retail store customers. We would like to integrate Shopify Admin with it. We will be fetching product details such as name, description, category, stock price etc from Shopify admin and then customer will checkout from our app while instore. The checked out orders will pushed back to Shopify to appear in daily sales support
2. We have our own POS system that we would like to integrate with Shopify Online store. Here the product details will come from our admin system.

Can you please help us to use appropriate apis for both the cases?

Thanks,

[YogeshWagh]

Ok, I did further research and found out these apis could be of use for scenario one for developing self checkout system:

https://shopify.dev/docs/admin-api/rest/reference/products/product#index-2020-07
https://shopify.dev/docs/admin-api/rest/reference/orders/order
https://shopify.dev/docs/admin-api/rest/reference/orders/order#create-2020-07
https://shopify.dev/docs/admin-api/rest/reference/customers/customer
https://shopify.dev/docs/admin-api/rest/reference/products/product-image
https://shopify.dev/docs/admin-api/rest/reference/products/product#index-2020-07

But I couldn't find a direct api to retrieve products from barcode. Appreciate if someone can help us on this part?

[Greg_Kujawa]

If you are just getting started into working with Shopify's API I would suggest looking to the GraphQL API instead of the REST API. The GraphQL (https://shopify.dev/docs/admin-api/graphql/reference) seems to have more functionality comparatively. 

Below is an example for pulling the ProductVariant based on the barcode value (assuming only one record has this particular barcode for my example).

{
  productVariants(first:1, query: "barcode:012345678901") {
    edges {
      node {
        id
        legacyResourceId
        title
        sku
        barcode
      }
    }
  }
}