Currently PayPal as one of the payment methods on Blackbaud Checkout donation forms is supported only on Blackbaud Online Express, Raiser's Edge NXT, Church Management, eTapestry, and Luminate Online.
If you have set up integration with BBMS on Almabase and use it on any of your giving campaigns or events, then it recommended to disable PayPal on BBMS.
Log in to the BBMS Web Portal
Go to Account Management > General Settings
Scroll down to Account Configurations and click the ellipsis to the left of the Account Configuration you wish to change
Under Supported credit cards, unmark the PayPal as one of the accepted type.
If you have any questions or concerns about this, feel free to reach out to Almabase Help.