First, understand that AppSheet is designed for internal business use apps and not as customer-facing type apps. So, there really isn't any DIRECTLY supported functionality for what you wish to do.
Having said that, AppSheet has great flexibility and you can create something that will work.
Basically, you want to create a special view that does nothing other than shows your message. Your message is best implemented into a Show type column. It can be a Virtual Column. You can probably get creative with additional columns of imagery and make something that looks really nice. In the special view, add only this message column plus any other supporting columns.
Create an action of type "go to another view within this app" and assign it the LINKTOVIEW() function specifying your special view.
If you already have a Group of actions for your "Check Out" process, then add this action to the END. Any navigation type actions MUST be the last action executed otherwise other necessary actions will get skipped and not execute.
If you DO NOT have a Grouped set of actions, then create one. Add your Check-Out action noted above and this new navigation action. CAUTION: This Grouped action will now become the "Check Out" process action so you will need to update the Confirmation and Behavior conditions to those that were originally assigned in the Check-Out action and then adjust the Check-Out action accordingly.
Now when user taps the button, they should be executing the Grouped action which will perform the confirmation. then execute the Check-Out action and then navigate to your special view.
I hope this helps!
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