If you want to disable the ‘Pay Later’ option, you must switch off the ‘Offline Payments’ and if you haven’t added it yet, you must switch on the ‘Online Payment’ option, then add your online payment gateway.
To switch off the ‘offline Payments’ apply the steps below;
Choose the ’Registration’ option from the left side menu,
Choose the ‘Payment Processing’ under the ‘REGISTRATION’ title,
Switch off the ‘Offline Payments’,
If required, add your online payment gateway (Learn more about how to add your online payment gateway),
Click the ‘Save Changes’ button at the bottom of the page.