To use the In-App messaging cababilities from Marketo, you need to perform the following steps:
Once you have installed the Marketo Mobile SDK, and completed adding your app in Marketo, you are ready to send In-App messages that display when a user opens your app.
By default in-app messages are triggered when your app opens. If you want to trigger in-app messages for other events, such as when a particular page is viewed, or when a specific button is pushed, you will need to add custom actions to your code. See Custom Actions section for code samples of this.
For additional information, please see the In-App Messages section in our product documentation.