If you want to change the Payment Methods section heading you can edit them by following the steps below:
Step 1: Select a Checkout page
Under the 'Design' tab, click on the 'Edit' button of the selected Checkout page.
The Customizer will open up.
Step 2: Navigate to Payment Methods section
Click on the 'Checkout Form' option on the left side panel.
Next, click on 'Form Settings' and scroll down to the field labeled 'Payment Methods'.
Here you can edit the Payment Methods section heading and sub-heading.
Step 3: Save your changes
Click on the 'Publish' button to save the changes.