Amazon MCF and Buy with Prime

MCF / Buy with Prime has saved my life as a business owner who is too busy to pack orders for my website. The product catalog syncs seamlessly. We have it running in the US and now we just launched MCF Canada and this is the best thing to have ever happened for our business. Thank you Wayne and team for serving us. LOVE IT!

The app is currently unusable. It is stuck indefinitely on "Loading catalog data in progress." After inspecting the console, I found a major authentication flaw in your API connection: {"message":"1 validation error detected: Value null at 'shopifySessionToken' failed to satisfy constraint: Member must not be null"}.

How is it possible that the session token is null when the connection is through Shopify's own platform? Furthermore, the API response confirms that the operation bulk_fulfillment_update for my domain (ayaecofashion.myshopify.com) does not exist. This lack of maintenance is directly affecting my sales and inventory management. Please address this backend failure immediately.

At first, we struggled to get the app working and installed and uninstalled it a few times. But once we followed the basic setup instructions properly, it worked flawlessly.

Previously, we were manually entering order details to fulfil orders through Amazon MCF. Now, every time we get an order in the UK or the US, we just click a button in Shopify. It has completely changed our workflow and allowed us to focus on growing the business instead of managing fulfilment. We were even thinking about setting up our own warehouse, but now 90% of our shipments go through Amazon services via this app.

Worked as intended. I was enrolled in a pilot to test additional features and the onboarding and communication was great and responsive.

Worst application, simple does not works, Amazon support is useless.

I was excited about this app as it promised to simplify my fulfilment process. I’ve used MCF before and expected this to remove the need for manually entering customer details. Instead, orders are sent to Amazon but remain stuck in “processing” and never get fulfilled, an issue others have also raised. Seller Support has been extremely poor — a 45-minute investigation resulted in generic responses and no resolution.

Isn't working anymore.

I was really excited to use the MCF Fast Badge for my Shopify store, but at first it wouldn’t appear on my live product page—even though it showed correctly in preview. I tried everything: matching SKUs, checking inventory, adjusting permissions, reinstalling, and even having Shopify reindex the page. Nothing worked initially.

However, Amazon has since fixed the issue, and the Fast Badge now displays perfectly on my site. Support was responsive throughout the process, and I appreciate that the team followed through and resolved it.

The feature works exactly as promised and is a great addition for improving conversions. Very happy it’s functioning properly now. Highly recommend!

As with any Amazon's product, the support is awful. Currently the app is sending fulfillment requests to Amazon, but MCF does not accept requests, nor does it provide any notification updates or support options. Amazon seller central support asks for Amazon MCF order number to proceed, which I don't have because the requests are not being received by Amazon.

Why is shipping speed mapping not available?