When the Item Group is set to private, users will not see the payment setting and so will not be able to pay. If you set the Item Group to public, users will then be able to see the payment settings at the end of the Registration and complete it fully. To edit this, navigate to:
  1. onMessage > Approval > Event Registration
  2. Click Edit into the Event Registration that is not displaying Payment
  3. Click on Registration Items
  4. Click Edit Group
  5. Select the Radio Button for Public or Private/Secure (this should match the the same option in the Security link within the Event Registration Form)
  6. Click Save & Exit