From your Apps Dashboard, select Add Connection, then select 1&1
Here, you can either Add another connection, or you can go ahead and Authorize the 1&1 connection.
Please insert the address of your shop's administration area. To do so, go to the administration area of your shop, copy the address from the address bar of your browser and paste the address here
You should now be re-directed to your 1&1. Please hit Install app
Great! Your 1&1 account is now connected, and authorized with your OneSaas file.
Now that you've connected your 1&1, you can either add another connection by selecting Add Connection, or move forward and configure your integration. For more information on how our setup process works, please check out our setup process walk through here.