Accelerated Checkouts: Add ShopifyAcceleratedCheckouts sample app (#328)

* feat: add sample app

* fix: package reference moves to CSK

* fix: shopDomain -> storefrontDomain

* refactor: reuse createApplePayConfiguration func

* feat: remove graphqls files from git tracking

* fix: remove graphqls from xcode project reference

* refactor: rename xcconfig Storefront to match MobileBuyIntegration

* fix: lint

* fix: ensure licenses

* refactor: reduce duplication for updating applepayconfig

* dev fix

* refactor: remove apollo ios cli from repo

* fix: remove redundant gitignore line

* refactor: remove unused test files from sample app

* refactor: move construction out of init

* fix: remove 0 spacing

* fix: rename include to require in settings too

* refactor: use app storage enum for keys

* fix: remove unnecessary binding

* fix: remove unnecessary refreshID

* fix: remove unused id's

* refactor: use bindings for cart - pass appropriate

* refactor: use env vars for previews

* refactor: remove scopes gitignore

* chore: update readme to include new sample

* dev fix

Author: kieran-osgood-shopify

.gitignore

@@ -8,3 +8,7 @@ xcuserdata
 .claude/
 CLAUDE.md
 
+# ShopifyAcceleratedCheckoutsApp
+*.graphqls
+apollo-ios-cli
+

Samples/MobileBuyIntegration/.gitignore

@@ -14,4 +14,18 @@ To get started you will first need to generate an `entitlements` file for the ap
 
 ```sh
 ./Scripts/setup_entitlements
-```
+```
+
+---
+
+## ShopifyAcceleratedCheckoutsApp
+
+This project demonstrates integrating Shopify's Accelerated Checkouts, an all in one solution to accelerated checkouts via Apple Pay and Shop Pay. 
+
+To get started:
+
+1. Copy the settings file:
+```sh
+cp Samples/ShopifyAcceleratedCheckouts/Storefront.xcconfig.example Samples/ShopifyAcceleratedCheckouts/Storefront.xcconfig
+```
+2. Modify each of the keys in `Storefront.xcconfig` to match the value in your store settings.

Samples/README.md

@@ -0,0 +1 @@
+!Storefront.xcconfig.example

Samples/ShopifyAcceleratedCheckoutsApp/.gitignore

@@ -0,0 +1,10 @@
+// --- Storefront
+// --- Find your Storefront API access token under:
+// ----- https://admin.shopify.com/store/{STOREFRONT}/settings/apps/development/{APP_ID}/api_credentials
+
+// Configuration settings file format documentation can be found at:
+// https://help.apple.com/xcode/#/dev745c5c974
+
+STOREFRONT_DOMAIN = shopify.my-shopify.com
+STOREFRONT_ACCESS_TOKEN = 123456
+API_VERSION = 2025-07