How can I redirect users back to my website after completing a payment on Shopify using the Shopify Buy button integrated on my Webflow CMS collection, and is it possible to pass parameters to Shopify to track which user (Memberstack) has made a payment?

To redirect users back to your Webflow site after a payment via a Shopify Buy Button, and track which Memberstack user made the payment, you’ll need to use Shopify's checkout URL options along with URL parameters.

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1. Understand How Shopify Buy Button Checkout Works  

• The Shopify Buy Button creates a cart that redirects users to the Shopify-hosted checkout page.
• After the transaction, Shopify shows a default thank you/payment confirmation page—there's no native support for a post-checkout redirect.
• However, you can pass URL query parameters (e.g., user ID or product ID) into the checkout session for tracking purposes.

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2. Capture the Memberstack User Info

• Use Memberstack custom attributes to identify the currently logged-in user, such as their unique Memberstack ID or email.
• You can dynamically insert these values into your Webflow page using Memberstack's front-end API or attributes like data-ms-member="email".

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3. Append Tracking Parameters to Shopify Cart URLs  

• Customize the Buy Button embed code or build a custom "Add to Cart" button that redirects to Shopify checkout while appending tracking values.
• Example parameterized checkout URL:  

  https://yourstore.myshopify.com/cart/12345678:1?checkout[email]=user@example.com&customuserid=abc123

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• Use:
• checkout[email] to pre-fill customer email
• Additional custom parameters (e.g., customuserid=xyz) for internal tracking

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• Note: Shopify may ignore unknown query parameters in the UI, but you can view them in the order’s referral URL in the admin dashboard for backend tracking.

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4. Handling Redirect After Payment

• Shopify does not support redirecting to external thank-you pages after checkout for standard plans using the Buy Button.
• Workaround:
• Use Shopify’s Order Status Page (OSP) section in Settings > Checkout to embed a script or a meta refresh tag for conditional redirect.
• Alternatively, customize the "Thank you" content (e.g., "Click here to return to our site") with a link back to Webflow like:

    https://yourdomain.com/thank-you?user=abc123

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5. Create a Matching Thank You Page in Webflow

• Build a /thank-you page that reads the returned user parameter from the URL.
• Optionally, use Memberstack front-end logic to personalize the thank-you message (e.g., "Thanks for your purchase, John!").

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Summary

To redirect and track users after a Shopify Buy Button checkout on Webflow:

• Pass Memberstack user data as URL params into the Shopify checkout URL.
• Customize Shopify’s thank-you page to include a manual link or redirect to your Webflow site if needed.
• Track user-based parameters via Shopify’s order referral URL or tags.
• Full auto-redirection requires Shopify Plus or advanced custom scripting in the order status page.