One flat contour is drawn round the whole rendered word, including its 3D walls and strokes, and grown outward into up to three concentric bands, drawn backmost. Because it wraps the finished render, a longer word or a deeper extrusion grows the sticker with it.
Sticker is applied as an Illustrator live effect, so the text stays editable. Change the word, the font, or any slider afterwards, and save the result as a Graphic Style to reuse it.
How to make sticker text in Illustrator → walks through the manual Illustrator steps, then shows the one-click version.