If your plan includes Reactiv Clips, you will need to follow these additional steps to setup App Clips™ for iOS.
1 - Create an App Group
From the Certificates, Identifiers & Profiles page in your Apple Developer account, select Identifiers in the sidebar, then click “+”.
On the next page, select App Groups, then Continue
Enter a Description for your App Group. The Identifier must equal the same value entered for the App identifier, prefixed with “group”. Click Continue, then Register.
2 - Update the App Identifier Capabilities
From the Certificates, Identifiers & Profiles page in your Apple Developer account, select Identifiers in the sidebar, then click on the app identifier created in for your Reactiv App.
Under Capabilities, check the boxes beside App Groups, then click on Configure.
In the newly opened window, select the App Group that was created in 1 - Create an App Group above. Then click Continue, and Save.
3 - Register an App Clip Identifier
From the Certificates, Identifiers & Profiles page in your Apple Developer account, select Identifiers in the sidebar, then click “+”.
On the next page, select App IDs, then Continue.
Then, select the App Clip type and Continue.
Under Parent App ID, select the Identifier created in 1 - Register an App Identifier. For Product Name, enter “Clip”. Click Continue.
Enter a Description for your Identifier. Under Capabilities, check the boxes beside App Groups, Associated Domains and Push Notifications. Click Continue, then Register.
From the Certificates, Identifiers & Profiles page in your Apple Developer account, select Identifiers in the sidebar, then click on the identifier created in the previous step.
Under Capabilities, beside App Groups, then click on Configure.
In the newly opened window, select the App Group that was created in 1 - Create an App Group. Then click Continue, and Save.