Shopify install

Start a Shopify OAuth install.

Enter the merchant's `myshopify.com` domain to begin the OAuth authorization flow. SymbioPulse validates the shop domain and completes token storage on the Laravel callback.

Install on Shopify

Use the permanent myshopify.com domain, not a custom storefront domain.

The OAuth callback validates Shopify HMAC, nonce state, and shop domain before storing the offline token.