If you are trying to upgrade or install 11.0 or any later version of Payments and receiving on screen error or package installation failure email from salesforce that look like the following:

In this case, please check the Identity Verification settings in your salesforce instance.
- Go to Salesforce setup.
- Search for Identity Verification.
- Click and open the view.
- Scroll to the bottom.
- Check if Manage Users is set to “Raise session to high assurance”, if yes then set it to “None”.
- Check if Manage profiles and permission sets" is set to “Raise session to high assurance”, if yes then set it to “None”.

If you continue facing this issue then please contact payments2us support team for further assistance.