> For the complete documentation index, see [llms.txt](https://features.revver.tech/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://features.revver.tech/features/3.-opt-features.md).

# 3. OPT Features

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[3.1 OPT Checkout Features](/features/3.-opt-features/3.1-opt-checkout-features.md)
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