> Portal Navigation:
> 
> - Append `.md` to any URL under `https://dev.wix.com/docs/` to get its markdown version.
> - Pages are either content pages (article or reference text) or menu pages (a list of links to child pages).
> - To get a menu page, truncate any URL to a parent path and append `.md` (e.g. `https://dev.wix.com/docs/sdk.md`, `https://dev.wix.com/docs/sdk/core-modules.md`).
> - Top-level index of all portals: https://dev.wix.com/docs/llms.txt
> - Full concatenated docs: https://dev.wix.com/docs/llms-full.txt

# [Velo](https://dev.wix.com/docs/api/get-menu-content?url=https%3A%2F%2Fdev.wix.com%2Fdocs%2Fvelo&format=markdown.md)

## [APIs](https://dev.wix.com/docs/velo/apis.md)


### [wix-billing-backend](https://dev.wix.com/docs/velo/apis/wix-billing-backend.md)


- [Introduction](https://dev.wix.com/docs/velo/apis/wix-billing-backend/introduction.md)

#### [Events](https://dev.wix.com/docs/velo/apis/wix-billing-backend/events.md)


- [Introduction](https://dev.wix.com/docs/velo/apis/wix-billing-backend/events/introduction.md)

- [onInvoiceCreated()](https://dev.wix.com/docs/velo/apis/wix-billing-backend/events/on-invoice-created.md)

- [onInvoiceOverdue()](https://dev.wix.com/docs/velo/apis/wix-billing-backend/events/on-invoice-overdue.md)

- [onInvoicePaid()](https://dev.wix.com/docs/velo/apis/wix-billing-backend/events/on-invoice-paid.md)

- [onInvoiceSent()](https://dev.wix.com/docs/velo/apis/wix-billing-backend/events/on-invoice-sent.md)

- [onPriceQuoteAccepted()](https://dev.wix.com/docs/velo/apis/wix-billing-backend/events/on-price-quote-accepted.md)

- [onPriceQuoteCreated()](https://dev.wix.com/docs/velo/apis/wix-billing-backend/events/on-price-quote-created.md)

- [onPriceQuoteExpired()](https://dev.wix.com/docs/velo/apis/wix-billing-backend/events/on-price-quote-expired.md)

- [onPriceQuoteSent()](https://dev.wix.com/docs/velo/apis/wix-billing-backend/events/on-price-quote-sent.md)


#### [Invoices](https://dev.wix.com/docs/velo/apis/wix-billing-backend/invoices.md)


- [Introduction](https://dev.wix.com/docs/velo/apis/wix-billing-backend/invoices/introduction.md)

- [addPayment()](https://dev.wix.com/docs/velo/apis/wix-billing-backend/invoices/add-payment.md)

- [createInvoice()](https://dev.wix.com/docs/velo/apis/wix-billing-backend/invoices/create-invoice.md)

- [createInvoicePreviewUrl()](https://dev.wix.com/docs/velo/apis/wix-billing-backend/invoices/create-invoice-preview-url.md)

- [deleteInvoice()](https://dev.wix.com/docs/velo/apis/wix-billing-backend/invoices/delete-invoice.md)

- [getInvoice()](https://dev.wix.com/docs/velo/apis/wix-billing-backend/invoices/get-invoice.md)

- [sendInvoice()](https://dev.wix.com/docs/velo/apis/wix-billing-backend/invoices/send-invoice.md)

- [updateInvoice()](https://dev.wix.com/docs/velo/apis/wix-billing-backend/invoices/update-invoice.md)

- [voidInvoice()](https://dev.wix.com/docs/velo/apis/wix-billing-backend/invoices/void-invoice.md)


#### [PriceQuotes](https://dev.wix.com/docs/velo/apis/wix-billing-backend/price-quotes.md)


- [Introduction](https://dev.wix.com/docs/velo/apis/wix-billing-backend/price-quotes/introduction.md)

- [createPriceQuote()](https://dev.wix.com/docs/velo/apis/wix-billing-backend/price-quotes/create-price-quote.md)

- [deletePriceQuote()](https://dev.wix.com/docs/velo/apis/wix-billing-backend/price-quotes/delete-price-quote.md)

- [getPriceQuote()](https://dev.wix.com/docs/velo/apis/wix-billing-backend/price-quotes/get-price-quote.md)

- [sendPriceQuote()](https://dev.wix.com/docs/velo/apis/wix-billing-backend/price-quotes/send-price-quote.md)

- [updatePriceQuote()](https://dev.wix.com/docs/velo/apis/wix-billing-backend/price-quotes/update-price-quote.md)