Follow this documentation to create checkboxes on your form.. The amount (price) of each checkbox that is checked will be added together for the PayPal or Stripe total.
Step 1: In a Contact Form 7 form, generate a new tag for a checkbox.
Step 2: Enter your checkbox options. Use a pipe “|” to separate your values from your price. Any character is allowed on the left of the pipe, but only numbers are allowed on the right.
Step 3: Your checkbox should have a name code. Something like checkbox-122. Copy that to your clipboard.
Step 4. On the PayPal tab, Paste the name code into the Price Code input box.
Save the form and copy the form code into a page or post. It should look something like this:
You can see I selected Option b ($3) and Option c($5). When I click the send button and go to PayPal my total will be $8.