> Deprecated: > Product subscription app extensions won't be supported as of December 3, 2025. You should migrate existing product subscription app extensions to [purchase options extensions](/docs/apps/build/purchase-options/purchase-options-extensions). CardSections are used to group similar concepts within a Card. CardSections add dividers, which visually separate regions within cards.
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## Guidelines
| ✅ Do | 🛑 Don't |
| ----------------------------------------------- | ------------------------------- |
| Use CardSection to split up content within Card | Use CardSection outside of Card |