> 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 # [Api Reference](https://dev.wix.com/docs/api/get-menu-content?url=https%3A%2F%2Fdev.wix.com%2Fdocs%2Fapi-reference&format=markdown.md) ## [App Management](https://dev.wix.com/docs/api-reference/app-management.md) ### [App Billing](https://dev.wix.com/docs/api-reference/app-management/app-billing.md) #### [Billing](https://dev.wix.com/docs/api-reference/app-management/app-billing/billing.md) - [Get Metered Billing Charges](https://dev.wix.com/docs/api-reference/app-management/app-billing/billing/get-metered-billing-charges.md) - [Get Purchase History](https://dev.wix.com/docs/api-reference/app-management/app-billing/billing/get-purchase-history.md) - [Get Url](https://dev.wix.com/docs/api-reference/app-management/app-billing/billing/get-url.md) - [Purchased Item Invoice Status Updated](https://dev.wix.com/docs/api-reference/app-management/app-billing/billing/purchased-item-invoice-status-updated.md) - [Introduction](https://dev.wix.com/docs/api-reference/app-management/app-billing/billing/introduction.md) - [Sample Flows](https://dev.wix.com/docs/api-reference/app-management/app-billing/billing/sample-flows.md)