Any time you can change the app status to enable or disable. 

If app status is,

• Enable : Verification process will be done as per selected settings.
• Disable : Verification process will be stopped, it will not confirm any of the order. And also it will not charge you anything.

How to change the status :

Step 1 : Open an app in your Shopify store.
Step 2 : On the home page you can see the enable/disabled application section.