> For the complete documentation index, see [llms.txt](https://docs.mercuri.cx/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.mercuri.cx/features/sms-opt-in-form.md).

# SMS Opt-in form

- [How to Add an SMS Opt-In Form to Your Wix Business Website](https://docs.mercuri.cx/features/sms-opt-in-form/how-to-add-an-sms-opt-in-form-to-your-wix-business-website.md)
- [How to fix the opt-in form issue in Wix?](https://docs.mercuri.cx/features/sms-opt-in-form/how-to-fix-the-opt-in-form-issue-in-wix.md)
- [Integrating SMS Opt-In with Your Shopify Store](https://docs.mercuri.cx/features/sms-opt-in-form/integrating-sms-opt-in-with-your-shopify-store.md)