How can I integrate Paypal payment?

how can I include into the form the paypal payment button that sends my client to the payment page?

In the Form Builder, go to the Payment fields and then click or drag the PayPal image. This will open up the Payment wizard and where you can set your payment options and products.

Please refer to these helpful guides:
https://www.jotform.com/help/165-Setting-Up-Your-First-Order-Form
https://www.jotform.com/help/50-PayPal-Forms
https://www.jotform.com/help/323-Mastering-Payment-Form-Integrations-with-JotForm

Hope that helps. Thank you.