Notifications and Triggers based on Payment Information being updated

Notifications and Triggers based on Payment Information being updated

When the customer updates their Payment Information (using the Request Payment Information link), I need to:
  1. Send notification to the Sales Rep that this step is complete (I can create this in Flow or use any native capabilities)

  2. Trigger an update (through Zoho Flow) to update the CRM Account to show this step is complete
I can't find any way to trigger actions in Flow based on the customer updating Payment Information. 

What am I missing?