How to add Metafields in Pickup Delivery Group using checkout extension/function

Extensions
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1

One of the Shopify store creating some amazing work to show available products in the selected pickup store in checkout page. I know it is in Shopify plus plan.

My client also wants to create same thing. as I checked competitor Shopify store developers are using “Local Pickup Delivery Option Generator API” and “Checkout UI” but I am not sure how they are adding metafields to get available quantity of the products in checkout extension/function. can someone please guide me how to add this type of metafields in checkout?

Please check below screenshots of competitor.

Customer-and-Shipping-Information-JB-Hi-Fi-Checkout-04-22-2025_06_31_PM
Customer-and-Shipping-Information-JB-Hi-Fi-Checkout-04-22-2025_06_31_PM1920×890 138 KB

image-04-22-2025_06_27_PM
image-04-22-2025_06_27_PM1885×875 151 KB

2

Hey @Jaydip_Kanasagra :waving_hand: - I can’t say for sure how they’re building their integration here, but Checkout UI Extensions do support metafields (more info here at this link: Metafields)

Just wanted to share that link as a starting point, we can’t help with fully replicating another app, but if you can share your use case, I’d be happy to take a look to see if we can offer some suggestions.