Are you talking about a Custom Field? Because trello cards don't have that field by default. To use our API with Custom Fields, please see the documentation.
If you are not referring to a Custom Field, you may be referring to a Power-Up enabled on your board, which in that case you may need to reach out to the Power-Up's developer instead. (Trello does not maintain any Power-Ups unless the Power-Up specifically says "Made by Trello" or "Made by Atlassian")
Congratulations to @Laura Holton , our latest winner of Taco Tuesday! And thanks to @Kristján Geir Mathiesen for sharing the picture of Taco having fun with his new friend B...
Connect with like-minded Atlassian users at free events near you!Find an event
Connect with like-minded Atlassian users at free events near you!
Unfortunately there are no Community Events near you at the moment.Host an event
You're one step closer to meeting fellow Atlassian users at your local event. Learn more about Community Events