Unlike a static bitcoin address you can share your payment code publicly without revealing your entire balance or transaction history.
Step 1 - Open the payment codes screen
From the main screen of the wallet press the blue '+' button located on the bottom right of the screen. Tap the purple Payment Codes button.
Step 2 - Open your payment code
From the payment code screen tap the QR code icon in the toolbar
Step 3 - Share your payment code
The text beginning with 'PM8T' is your payment code. You can Tap the text to copy it to your clipboard.
You can also share a copy of the QR code image of your payment code by tapping the share icon in the toolbar.