Simple answer - you don't. If you're an existing Fetchify client migrating to Checkout Extensions or from another platform to Shopify Plus, you won't need your existing access token.
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We've partnered with Shopify Plus using their Billing API to be able to bill your Fetchify app charges on your monthly or annual Shopify invoice. One less supplier to worry about and a more flexible way to buy the Fetchify products for Shopify Plus.

Once you've tested the app and are ready to go live, just get in touch and we'll migrate any remaining credits in your current Fetchify account into the app. We'll keep the same expiry date, and when you need more credits you'll be able to buy them through the app. Just get in touch with your account manager or our customer support team to find out more.