> For the complete documentation index, see [llms.txt](https://whatcrm.gitbook.io/whatcrm-docs/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://whatcrm.gitbook.io/whatcrm-docs/english/useful-articles.md).

# Useful articles

- [What does the "Group Work" feature + activation of the setting mean](https://whatcrm.gitbook.io/whatcrm-docs/english/useful-articles/what-does-the-group-work-feature-+-activation-of-the-setting-mean.md)
- [Recommendations for stable work with WhatsApp](https://whatcrm.gitbook.io/whatcrm-docs/english/useful-articles/recommendations-for-stable-work-with-whatsapp.md): To ensure stable operation of the WhatsApp integration, follow these recommendations:
- [Important recommendations when using Whatcrm](https://whatcrm.gitbook.io/whatcrm-docs/english/useful-articles/important-recommendations-when-using-whatcrm.md)
- [If you have been banned in WhatsApp](https://whatcrm.gitbook.io/whatcrm-docs/english/useful-articles/if-you-have-been-banned-in-whatsapp.md): What to do if your number is banned in WhatsApp
- [Telegram restrictions](https://whatcrm.gitbook.io/whatcrm-docs/english/useful-articles/telegram-restrictions.md)
- [Attachment limits](https://whatcrm.gitbook.io/whatcrm-docs/english/useful-articles/attachment-limits.md)
- [Cancel subscription](https://whatcrm.gitbook.io/whatcrm-docs/english/useful-articles/cancel-subscription.md)
- [How to Update Invoice and Receipt Information for Clients (Stripe)](https://whatcrm.gitbook.io/whatcrm-docs/english/useful-articles/how-to-update-invoice-and-receipt-information-for-clients-stripe.md)