Overpay

Overpay is a card checkout. Read the Overpay docs for your account setup.

What you need

Field	Where to find it
Shop ID	Overpay shop settings. A number, like `12345`
Public Key	Overpay shop settings
Secret Key	Overpay shop settings

Copy your keys

Open your Overpay shop and copy the Shop ID, Public Key and Secret Key.

Connect in Join Markt

Go to Payment methods → Overpay. Paste all three. Keep Sandbox on to test first.

Add the webhook

In Overpay shop settings, set the webhook URL:

https://dash.joinmarkt.com/api/overpay/webhook

Overpay signs it with HTTP Basic auth, using the same Shop ID and Secret Key.

Turn it on

Enable Active at checkout, then save.

The order is marked paid only when the webhook arrives. Never deliver before that.