"Permissions Request XML" to grant permissions at different levels to App Step

Please find the below mentioned Request XML to grant permission at different level based on the requirement:

User profile (If you want permission to User Profiles):

<AppPermissionRequests>

    <AppPermissionRequest Scope="http://sharepoint/social/tenant" Right="Read" />

  </AppPermissionRequests>

Permission at all site collections (If you want permission on all site collections within the Tenant):

  <AppPermissionRequests>

    <AppPermissionRequest Scope="http://sharepoint/content/tenant" Right="Read" />

  </AppPermissionRequests>

Full permission at site collection (If you want permission at Site collection):

<AppPermissionRequests> 

  <AppPermissionRequest Scope="http://sharepoint/content/sitecollection" Right="FullControl" /> 

</AppPermissionRequests>

Full permission at sub site (If you want permission at Sub-Site under Site collection):

<AppPermissionRequests> 

  <AppPermissionRequest Scope="http://sharepoint/content/sitecollection/web" Right="FullControl" /> 

</AppPermissionRequests>

Note: 

1. Copy paste the above given XML as it is. Do not replace "Scope" value.
2. Replace the "Rights" value with your required role: Read, FullControl, Contribute, etc.,