> For the complete documentation index, see [llms.txt](https://guides.usequeue.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://guides.usequeue.com/services.md).

# Services

- [Services](https://guides.usequeue.com/services/services.md): Learn how services work on Queue
- [Add-ons](https://guides.usequeue.com/services/services/add-ons.md)
- [Discounts](https://guides.usequeue.com/services/services/discounts.md)
- [Credit Tracking](https://guides.usequeue.com/services/services/credit-tracking.md)
- [Integrating stripe](https://guides.usequeue.com/services/integrating-stripe.md)
- [Checkout](https://guides.usequeue.com/services/checkout.md)
- [Subscriptions](https://guides.usequeue.com/services/subscriptions.md): How does subscriptions work on Queue?
- [Upgrading / Downgrading plans](https://guides.usequeue.com/services/subscriptions/upgrading-downgrading-plans.md)
- [Advanced options](https://guides.usequeue.com/services/subscriptions/advanced-options.md): Learn how to use advanced options to manage subscriptions.
- [Retention Promos](https://guides.usequeue.com/services/subscriptions/retention-promos.md): Learn how to retain your clients by offering promotions when they unsubscribe.
- [Referral Program](https://guides.usequeue.com/services/referral-program.md)
- [Time Tracking](https://guides.usequeue.com/services/time-tracking.md)
- [Invoices](https://guides.usequeue.com/services/invoices.md)
- [Invoices with credit track](https://guides.usequeue.com/services/invoices/invoices-with-credit-track.md)