> For the complete documentation index, see [llms.txt](https://developer.musehub.com/muse-partners-help/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://developer.musehub.com/muse-partners-help/adding-products/pricing/pay-once.md).

# Pay once

Paid products are "purchase once" or perpetual license products, in which the customer buys a license to use the product indefinitely.

You can setup products for a simple paid model by setting up a base price and any discount schedules you want, as well as setting any trial duration. 

You can set this up by clicking the "+" on the Purchase Price Schedule section. 

### Base Price

Start by defining a base [price tier](/muse-partners-help/adding-products/pricing/price-tiers.md). This is set in USD, and represnts the "starting" price, before you run sales or discounts. Set a date for this base price to go in effect; if there is no active price, and this date is in the future, your app won't be able to purchased until then. 

If there is an active base price, then setting a new base price (with a start date) is akin to changing the price of the product from then on.

### Trial Days

Thanks to the Muse DRM system, you can easily set whether or not your want your product to be offered with a free time-limited trial. If so, you can set the number of days the trial can be active for here. 

{% hint style="info" %}
We recommend offering a 3-day free trial.
{% endhint %}

After the trial period has expires, Muse DRM will block the application from exectuing, and display a "missing or expired license" pop up, encouraging users to return to MuseHub to buy the product. 

Please note that the customer must purchase a license through the MuseHub once the trial has expired, it does not automatically roll in to a purchased license.