Shopify-to-POS Order Integration

I run a Shopify store and a self-developed point-of-sale system in the shop. At the moment every online order is typed into the POS by hand, which is slow and error-prone. I want the full order record—customer information, line-items, pricing, taxes, payment status, shipping method, the lot—to travel from Shopify straight into the POS automatically.

Because the POS is custom built, there is no ready-made connector. I am open to the most reliable method you recommend: a direct REST or GraphQL pull from Shopify, webhooks that post to an endpoint you add to the POS, or a lightweight middleware service that translates the data format—whatever gives me real-time or near-real-time sync without manual work.

What matters is that every field Shopify provides to complete an order is reproduced in my system and that the process keeps working after Shopify updates its API version. If some groundwork is needed on the POS side (for example creating an endpoint or small API layer) please include that in the scope.

Acceptance criteria
• A new Shopify order appears in the POS automatically within a couple of minutes.
• All order fields required to process and fulfill are present and accurate.
• Error handling and basic logging allow me to see if something fails.
• Clear, commented code or configuration plus a short hand-off document so my team can maintain it.

Let me know which approach you plan to take, the technologies you will use, and an estimated timeline so we can get started.