Adding Apps from Catalog or Store using CSOM API
As provisioning process, we would love to either add apps from app catalog or store directly using CSOM APIs. This should include the 'I Trust it' model as well. This will help in automating the entire site/sub-site provisioning and making sure apps are available after site is created.
Karim Roumani commented
Is there a PowerShell way to do this from the store?