Go to the Pages section and select any page in the list. Then go to a section and select a link (it can be a standalone link, a link in a collection or a rich text editor link).

Change the Link type to Make a payment.

You will see the Add payment details button. Click on it.

You will be navigated to the Payment templates selection screen. Select a payment template or create a new one.

Next you will be navigated back to the Payment link screen. You will see the selected template details in the Payment details section.

You can edit or replace the selected payment template.

Click the Publish button in the main toolbar, wait for the website to be generated.

Find your CTA payment link and click on it. You will be navigated to the checkout page containing all the details you defined previously.

Once it is successfully paid. You can find it listed in the Invoices screen under the Paid filter.