How to pay with Venmo on mobile
1a. iPhones must use Safari browser, does not work in Private Browsing.
1b. Android phones must use Chrome browser, does not work in Incognito Mode.
2. Must opt into, "Enable Mobile Web Purchase" in Venmo app.
2a. To enable it, tap on the ☰ icon in the upper left corner of the Venmo app, then tap on Settings. In Settings, there's the Buying section. To use Venmo to pay during checkout, tap 'Enable Mobile Web Purchase' or Connect Browsers.
Note: If you're still not seeing the Venmo option, make sure you turn off PayPal OneTouch. For more information about how to change PayPal OneTouch settings, go to www.paypal.com/us/webapps/mpp/one-touch-checkout/faq.