To turn off push notifications from OnDeck you must do it in your preferences and by application.

iOS

  1. Launch Settings.
  2. Tap Notifications.
  3. Scroll down to find OnDeck and tap.
  4. Turn off Allow Notifications.

Android

  1. Launch Settings.
  2. Tap Apps Manager (may vary depending on phone).
  3. Scroll down to find OnDeck and tap.
  4. Uncheck Show Notifications found at the top under the Force Stop button.

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See Also
Communicate via email, SMS and push notifications
Add and verify a cell number for SMS/texting