> For the complete documentation index, see [llms.txt](https://docs.digitalriver.com/salesforce-lightning/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.digitalriver.com/salesforce-lightning/user-guide-optional.md).

# User guide

The Salesforce Lightning user guide includes the following topics:

* [Regulatory fees](/salesforce-lightning/user-guide-optional/regulatory-fees.md)
* [Tax certificates](/salesforce-lightning/user-guide-optional/tax-certificate.md)
* [Tax identifiers](/salesforce-lightning/user-guide-optional/tax-identifiers.md)
* [My wallet](/salesforce-lightning/user-guide-optional/my-wallet.md)
* [Checkout and order creation](/salesforce-lightning/user-guide-optional/proceed-to-checkout.md)
* [Fulfillment/cancellation flow](/salesforce-lightning/user-guide-optional/fulfillment-and-cancellation-flow.md)
* [Refunds](/salesforce-lightning/user-guide-optional/refunds.md)
* [Invoices and credit memos](/salesforce-lightning/user-guide-optional/vat-invoices.md)