The two most-used connectors, and the two most often wired up with the sync direction backwards.
Step 1: get the API key
In QuickBooks the key sits under Settings → Connections. For Stripe you need both the publishable key and the secret key issued for the live environment.
Step 2: choose the sync direction
Invoices should flow one way from {{site_title}} into accounting; payment status flows back the other way. Setting both to two-way is how you create an update loop.

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