Did you create your website under the provider 1&1? Also with this it is possible to integrate the Smart Widget of AppYourself into your web presence. Go to the AppYourself Dashboard to copy the JavaScript code of the Smart Widget under Promote> Smart Website. Here you can set whether an automatic forwarding to your native or Progressive Web App and/or the Messenger should be inserted into your website (confirm with Save).
Then log in to your 1&1 website and go to the Editor menu Settings> Header HTML. In the window shown there you can now integrate the JavaScript code of the Smart Widget into your website. By clicking Save, this setting is applied.
Source: 1&1
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