I am very excited about this new and bleeding-edge feature, because it has been a long-standing ambition of Bull Bitcoin to become the first Bitcoin exchange to process Bitcoin withdrawals via Payjoin (Pay-to-Endpoint) transactions.— Francis Pouliot
To send via Payjoin, simply paste the receiver's Payjoin invoice, or scan the associated QR code, in the Bull Bitcoin wallet. If you decide that you don’t want to pay with Payjoin, simply turn off the Payjoin toggle.
Read more here: https://www.bullbitcoin.com/blog/bull-bitcoin-wallet-payjoin
Download the wallet (Google Play): https://play.google.com/store/apps/details?id=com.bullbitcoin.mobile&pli=1