Unable to see Chargebee button(s) in salesforce UI

Summary

After adding chargebee button on the Object like Opportunity page layout, it is not displayed in Classic/ lighting view.

Solution

If you are using dynamic actions ; please follow the below steps:

Go to an Opportunity > Click gear icon> Edit page

Click on the highlight bar and check the actions added

Add the action to this list and try again.

Reference :

Help And Training Community