Demonstration of the different types of PayPal buttons available on PayPal Checkout.
Insert your REST API Sandbox Client ID on line 112. If you need a Client ID, visit https://developer.paypal.com to create a REST API app.
Options obtained from: https://developer.paypal.com/docs/integration/direct/express-checkout/integration-jsv4/customize-button/ March 7, 2018.
For Sandbox testing, you can use your Developer Tools to test as a mobile device. For Live integrations, Venmo will only show on mobile devices where Venmo is installed and the user is opted into mobile payments.