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

# Projected invoice

> Calculate a projected invoice breakdown based on expected mint and verification volumes.

```http theme={null}
POST /v1/billing/projected-invoice
```

Returns a line-item invoice projection based on the usage volumes you provide. This is a public endpoint — no authentication is required. Use it for pricing calculators, cost forecasting, or pre-sales tools.

Regional pricing adjustments are applied when you include a `country_code`.

## Request body

<ParamField body="mints" type="integer" required>
  Number of attestation mints to include in the projection.
</ParamField>

<ParamField body="verifications" type="integer" required>
  Number of verifications to include in the projection.
</ParamField>

<ParamField body="country_code" type="string">
  ISO 3166-1 alpha-2 country code for regional pricing adjustment (e.g., `US`, `NG`, `KE`). Defaults to Tier 1 (global) rates if omitted.
</ParamField>

<ParamField body="plan_key" type="string">
  Plan identifier to include the platform fee in the projection (e.g., `plan_starter`, `plan_business`). If omitted, the platform fee is excluded.
</ParamField>

## Response

<ResponseField name="line_items" type="object[]">
  Breakdown of projected charges.

  <Expandable>
    <ResponseField name="description" type="string">
      Line item description (e.g., "Credential mints").
    </ResponseField>

    <ResponseField name="quantity" type="integer">
      Number of units.
    </ResponseField>

    <ResponseField name="unit_price_cents" type="integer">
      Per-unit price in cents.
    </ResponseField>

    <ResponseField name="total_cents" type="integer">
      Total cost for this line item in cents.
    </ResponseField>
  </Expandable>
</ResponseField>

<ResponseField name="subtotal" type="integer">
  Usage charges subtotal in cents (before platform fee).
</ResponseField>

<ResponseField name="total" type="integer">
  Total projected cost in cents (usage + platform fee).
</ResponseField>

<ResponseField name="currency" type="string">
  Currency code (`USD`).
</ResponseField>

<ResponseField name="rates_used" type="object">
  The rates applied to this projection.

  <Expandable>
    <ResponseField name="mint_rate_cents" type="integer">
      Per-mint rate in cents.
    </ResponseField>

    <ResponseField name="verify_rate_cents" type="integer">
      Per-verification rate in cents.
    </ResponseField>

    <ResponseField name="platform_fee" type="integer">
      Monthly platform fee in cents.
    </ResponseField>

    <ResponseField name="region" type="string">
      Pricing region tier applied.
    </ResponseField>

    <ResponseField name="multiplier" type="number">
      Regional price multiplier.
    </ResponseField>
  </Expandable>
</ResponseField>

<Info>
  All amounts are in cents. Divide by 100 to convert to dollars. Regional multipliers apply automatically when you include a `country_code`.
</Info>


## OpenAPI

````yaml mint-openapi.yaml POST /v1/billing/projected-invoice
openapi: 3.0.3
info:
  title: Truthlocks API
  description: >
    Truthlocks is a universal verification infrastructure for documents,
    credentials, and digital assets.

    This specification defines the canonical API for interacting with Truthlocks
    services.


    ## Base URLs

    - **Production**: `https://api.truthlocks.com`

    - **Sandbox**: `https://sandbox-api.truthlocks.com`


    ## Authentication

    - **API Keys**: Use `X-API-Key` header for machine-to-machine operations

    - **Bearer Tokens**: Use `Authorization: Bearer <jwt>` for user-initiated
    operations


    ## Tenant Identity

    In production, tenant identity is derived from the authenticated context
    (API key or JWT).

    The `X-Tenant-ID` header is ignored in production to prevent spoofing.
  version: 1.0.0
  contact:
    name: Truthlocks Support
    url: https://truthlocks.com/support
    email: support@truthlocks.com
servers:
  - url: https://api.truthlocks.com
    description: Production API
  - url: https://sandbox-api.truthlocks.com
    description: Sandbox Environment
security:
  - APIKey: []
tags:
  - name: Authentication
    description: API key and token management
  - name: Issuers
    description: Issuer registration and trust management
  - name: Keys
    description: Cryptographic key management for issuers
  - name: Attestations
    description: Attestation lifecycle (mint, revoke, supersede)
  - name: Verification
    description: Attestation verification and proof bundles
  - name: Governance
    description: Issuer governance workflows (admin only)
  - name: Identity
    description: Organization, user, and role management
  - name: Audit
    description: Audit event queries
  - name: Platform
    description: Platform administration (super admin only)
  - name: Platform Review
    description: Staff review workflows for issuer applications
  - name: Tenant Console
    description: Tenant profile and lifecycle endpoints
  - name: Health
    description: Service health and readiness endpoints
  - name: Risk
    description: Risk signal ingestion and fraud detection
  - name: Risk Enforcement
    description: Risk enforcement actions — block, challenge, quarantine, and configuration
  - name: Billing
    description: Billing, subscription, and addon management
  - name: Machine Identity
    description: >-
      Machine Agent Identity Protocol (MAIP) — agent registration, sessions,
      trust, witness, compliance, orchestration, and observability
externalDocs:
  description: Transparency read-only API (separate service spec)
  url: >-
    https://github.com/truthlocks/truthlock/blob/main/docs/transparency/openapi.yaml
paths:
  /v1/billing/projected-invoice:
    post:
      tags:
        - Billing
      summary: Project next invoice
      description: >-
        Returns a projected invoice for the next billing cycle based on current
        usage trends.
      operationId: billing.projectedInvoice
      requestBody:
        content:
          application/json:
            schema:
              type: object
              properties:
                plan:
                  type: string
                  description: Optional plan override for projection
      responses:
        '200':
          description: Projected invoice
          content:
            application/json:
              schema:
                type: object
                properties:
                  projected_total:
                    type: number
                  currency:
                    type: string
                  period_start:
                    type: string
                  period_end:
                    type: string
                  line_items:
                    type: array
                    items:
                      type: object
        '401':
          description: Authentication required
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ErrorEnvelope'
      security:
        - APIKey: []
components:
  schemas:
    ErrorEnvelope:
      type: object
      required:
        - code
        - message
        - http_status
      properties:
        code:
          type: string
          description: Machine-readable error code
          enum:
            - AUTH_REQUIRED
            - AUTH_INVALID
            - PERMISSION_DENIED
            - TENANT_IDENTITY_UNVERIFIED
            - NOT_FOUND
            - VALIDATION_ERROR
            - CONFLICT
            - PAYLOAD_TOO_LARGE
            - RATE_LIMIT_EXCEEDED
            - QUOTA_EXCEEDED
            - SERVICE_UNAVAILABLE
            - INTERNAL_ERROR
        message:
          type: string
          description: Human-readable error message
        http_status:
          type: integer
          description: HTTP status code
        retry_after_ms:
          type: integer
          description: Milliseconds to wait before retrying (for rate limits)
        details:
          type: object
          description: Additional error context
      example:
        code: AUTH_REQUIRED
        message: Authentication required
        http_status: 401
  securitySchemes:
    APIKey:
      type: apiKey
      in: header
      name: X-API-Key
      description: API key for machine-to-machine authentication

````