Description: Integrate PayPal as a payment gateway option within HeyForm. Users filling out forms should be able to complete payments directly using PayPal. This feature should support various currencies and ensure secure transactions, with an easy setup process for form creators. User Story: As a form creator, I want to enable PayPal payments on my forms so that users can complete transactions securely and efficiently. Acceptance Criteria: The form creator can select PayPal as a payment method when creating or editing a form. Users can pay using PayPal directly from the form. Transactions are processed securely and confirmations are sent to both the form creator and the user.