> ## Documentation Index
> Fetch the complete documentation index at: https://docs.praxis-ai.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Billing & Subscriptions

> Purchase credits, manage subscriptions, retrieve invoices, and connect Pria to your Stripe billing.

Pria runs on a credit-based billing model. Credits are purchased through Stripe, applied to an Account or a Digital Twin, and consumed as users interact with Pria. This page covers how billing works, where it lives in the platform, and how to manage payment methods, invoices, and subscriptions.

## Billing model overview

Every interaction with Pria consumes tokens. Pria converts tokens into **credits** before billing so the cost is predictable regardless of which underlying model answered the request.

<CardGroup cols={2}>
  <Card title="One credit = 10,000 tokens" icon="coins">
    The default conversion ratio. Both input and output tokens count toward the total.
  </Card>

  <Card title="Cached tokens at 50%" icon="percent">
    When a provider serves part of a prompt from its prompt cache, those tokens are billed at half the normal rate.
  </Card>
</CardGroup>

The discount that caching provides is surfaced on every interaction in the **Dialog Report Card** and in **Admin → History**, so you can verify the realized savings on a per-call basis.

<Tip>
  For a deeper walkthrough of token math, caching, and how credits are calculated for any single interaction, see [Plans & Credits](/mdx/introduction/plans-and-credits).
</Tip>

## Where billing lives

Billing decisions are made at three scopes — but money only flows in at one of them.

<AccordionGroup>
  <Accordion title="Account (parent)" icon="building">
    Accounts hold the master credit balance for organizations that operate multiple Digital Twins. Purchases for the Account flow into a shared pool that can then be distributed to one or more instances.
  </Accordion>

  <Accordion title="Digital Twin / Instance" icon="layer-group">
    Each Digital Twin tracks its own credit balance. When **Pool Credits** is enabled on the instance, all member interactions draw from this balance instead of from individual users.
  </Accordion>

  <Accordion title="User (personal)" icon="user">
    Individual users keep a personal credit balance that funds activity in Pria's personal instance and in any Digital Twin where credit pooling is turned off.
  </Accordion>
</AccordionGroup>

<Note>
  Purchases are made at the **Account** level or at the **User** level. There is no per-instance Stripe customer — instance balances are funded by transfers from the parent Account. See [Credit Allocation & Transfers](/mdx/admin-guide/credit-management).
</Note>

## One-time credit purchases

One-time purchases use **Stripe Checkout** and are the most common way to top up credits.

<Steps>
  <Step title="Open the credits gallery">
    From your profile, choose **Add Credits**. The gallery shows Personal and Digital Twin packages.
  </Step>

  <Step title="Pick a package">
    Larger packages unlock progressively better per-credit pricing. Credits **never expire**.
  </Step>

  <Step title="Complete checkout">
    Stripe handles card capture, 3-D Secure, tax, and receipts. On success, the credits are applied immediately and a Stripe receipt is emailed.
  </Step>
</Steps>

## Subscriptions

Subscriptions deliver a recurring credit allotment on a fixed cadence. They are intended for Accounts that want predictable monthly or annual spend, and for the **Named User Subscription** model where total credits scale with population size.

<Info>
  To start, change, or cancel a subscription contract for your Account, contact the Praxis AI team at [humans@praxis-ai.com](mailto:humans@praxis-ai.com) to request access.
</Info>

Once a subscription is active, recurring billing, dunning, and payment-method updates are handled entirely through the Stripe Billing Portal.

## Stripe Billing Portal

The Stripe Billing Portal is your self-service surface for everything Stripe owns: payment methods, billing history, invoices, and subscription cancellation.

<CardGroup cols={2}>
  <Card title="Open the portal" icon="external-link">
    From your profile, choose **Manage Billing**. Pria generates a portal session and redirects you to Stripe.
  </Card>

  <Card title="Returns you to Pria" icon="arrow-left">
    When you close the portal, Stripe sends you back to your profile — any change you made (new card, cancelled subscription, etc.) is immediately reflected.
  </Card>
</CardGroup>

From the portal you can:

* Add or replace credit cards and bank accounts
* Download itemized invoices and receipts in PDF
* Update the billing address used on invoices
* Cancel an active subscription
* View the full charge history for the Account

## Plan tiers

Pria offers two parallel ladders of one-time credit packages: **Personal** (for individuals topping up their own balance) and **Volume** (for Accounts and Digital Twins). Pricing improves as the bundle grows.

<Tabs>
  <Tab title="Personal">
    | Package | Cost  | Credits | Per Credit |
    | ------- | ----- | ------- | ---------- |
    | Silver  | \$10  | 90      | 11.00¢     |
    | Premium | \$25  | 238     | 10.50¢     |
    | Pro     | \$50  | 500     | 10.00¢     |
    | Gold    | \$120 | 1,263   | 9.50¢      |
    | Diamond | \$300 | 3,333   | 9.00¢      |
  </Tab>

  <Tab title="Volume">
    | Package | Cost     | Credits | Per Credit |
    | ------- | -------- | ------- | ---------- |
    | Level 1 | \$1,000  | 11,428  | 8.75¢      |
    | Level 2 | \$2,750  | 32,352  | 8.50¢      |
    | Level 3 | \$5,000  | 60,606  | 8.25¢      |
    | Level 4 | \$9,500  | 117,283 | 8.10¢      |
    | Level 5 | \$41,500 | 518,750 | 8.00¢      |
  </Tab>
</Tabs>

For the full breakdown — including the Named User Subscription model and caching examples — see [Plans & Credits](/mdx/introduction/plans-and-credits).

## Trial credits

Every new Account starts with a free trial allocation so users can evaluate Pria before purchasing.

<Card title="50 credits / 14 days" icon="gift">
  New accounts are seeded with **50 credits** on signup and **14 days** of trial access. Trial credits can be spent against any Digital Twin the user can reach.
</Card>

When the trial expires or the credits run out, users are prompted to add credits before continuing.

## BYOK and billing

When you bring your own provider keys ("Bring Your Own Tokens" / BYOT), Pria routes the call directly against your provider account using your key. **Tokens spent through your own keys bypass Pria's credit system entirely** — you pay the provider on their bill, not Pria.

<Note>
  Pria still applies a 40% discount to its **base service fees** for BYOK customers. Standard setup and support charges are unchanged. See [Bring Your Own Model](/mdx/introduction/byot).
</Note>

A mixed model — BYOK for one provider, Pria credits for another — is fully supported and is configured per-model in **Admin → AI Models**.

## Refunds and exceptional adjustments

Refunds, credit grants for service incidents, and other exceptional adjustments are handled manually so that an audit trail exists for every change.

<Warning>
  To request a refund, a goodwill credit, or a balance correction, contact the Praxis AI team at [humans@praxis-ai.com](mailto:humans@praxis-ai.com) to request access.
</Warning>

Routine credit transfers between an Account and its instances are self-service — see [Credit Allocation & Transfers](/mdx/admin-guide/credit-management).

## Related

* [Plans & Credits](/mdx/introduction/plans-and-credits) — full pricing tables and caching math
* [Credits](/mdx/user-guide/credits) — user-facing view of how credits are spent
* [Credit Allocation & Transfers](/mdx/admin-guide/credit-management) — moving credits between Account, Instance, and User
* [Bring Your Own Model](/mdx/introduction/byot) — bypass Pria credits with your own provider keys
* [Accounts Overview](/mdx/admin-guide/accounts/overview) — Account structure and ownership