Hi I have the same problem:
Picture of output below. I'm trying to upgrade from 3.9 to 3.10
Regards
Steve

To expand on what Howard said: payment gateways were introduced in Moodle 3.10 so the table mdl_paygw_paypal should not exist in the Moodle 3.9 site's database. You can check if it exists with the SQL query:
SHOW TABLES LIKE 'mdl_paygw_paypal';
Nothing should be returned. If this table does already exist you can remove it with DROP TABLE mdl_paygw_paypal (always make a backup of the database before making changes like this).
This kind of problem normally happens if an attempted upgrade has been rolled back to the previous version. The default behaviour when MySQL or MariaDB restores a database is to leave any new tables in place, resulting in this Moodle upgrade error because the table is unexpected.