openapi: 3.1.0
info:
  title: Orb Alerts Credits API
  description: Orb is a usage-based billing and metering platform. The REST API ingests timestamped usage events, models customers, plans, prices, items, and billable metrics, manages subscriptions, and automates invoicing, credit ledgers, coupons, alerts, and webhooks. All endpoints are served over HTTPS at https://api.withorb.com/v1 and authenticated with a Bearer API key.
  termsOfService: https://www.withorb.com/legal/terms-of-service
  contact:
    name: Orb Support
    url: https://www.withorb.com
    email: team@withorb.com
  version: '1.0'
servers:
- url: https://api.withorb.com/v1
  description: Orb production API
security:
- bearerAuth: []
tags:
- name: Credits
paths:
  /customers/{customer_id}/credits:
    parameters:
    - $ref: '#/components/parameters/CustomerId'
    get:
      operationId: fetchCustomerCredits
      tags:
      - Credits
      summary: Fetch customer credit balance
      description: Returns the unexpired, available credit blocks for a customer.
      responses:
        '200':
          description: The customer's credit blocks.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/CreditBlockList'
  /customers/{customer_id}/credits/ledger:
    parameters:
    - $ref: '#/components/parameters/CustomerId'
    get:
      operationId: fetchCustomerCreditsLedger
      tags:
      - Credits
      summary: Fetch customer credits ledger
      description: Returns the full ledger of credit additions, decrements, and expirations.
      parameters:
      - $ref: '#/components/parameters/Cursor'
      - $ref: '#/components/parameters/Limit'
      responses:
        '200':
          description: A paginated credit ledger.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/LedgerEntryList'
  /customers/{customer_id}/credits/ledger_entries:
    parameters:
    - $ref: '#/components/parameters/CustomerId'
    post:
      operationId: createLedgerEntry
      tags:
      - Credits
      summary: Create ledger entry
      description: Adds, sets expiry, voids, or amends credits on a customer's ledger.
      requestBody:
        required: true
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/LedgerEntryCreate'
      responses:
        '201':
          description: The created ledger entry.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/LedgerEntry'
  /customers/{customer_id}/credits/top_ups:
    parameters:
    - $ref: '#/components/parameters/CustomerId'
    post:
      operationId: createTopUp
      tags:
      - Credits
      summary: Create top-up
      description: Configures an automatic credit top-up that fires when a balance falls below a threshold.
      requestBody:
        required: true
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/TopUpCreate'
      responses:
        '201':
          description: The created top-up.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/TopUp'
    get:
      operationId: listTopUps
      tags:
      - Credits
      summary: List top-ups
      responses:
        '200':
          description: The customer's top-ups.
          content:
            application/json:
              schema:
                type: object
                properties:
                  data:
                    type: array
                    items:
                      $ref: '#/components/schemas/TopUp'
components:
  schemas:
    CreditBlock:
      type: object
      properties:
        id:
          type: string
        balance:
          type: number
        status:
          type: string
          enum:
          - active
          - pending_payment
        effective_date:
          type: string
          format: date-time
          nullable: true
        expiry_date:
          type: string
          format: date-time
          nullable: true
        per_unit_cost_basis:
          type: string
          nullable: true
    PaginationMetadata:
      type: object
      properties:
        has_more:
          type: boolean
        next_cursor:
          type: string
          nullable: true
    LedgerEntryList:
      type: object
      properties:
        data:
          type: array
          items:
            $ref: '#/components/schemas/LedgerEntry'
        pagination_metadata:
          $ref: '#/components/schemas/PaginationMetadata'
    CreditBlockList:
      type: object
      properties:
        data:
          type: array
          items:
            $ref: '#/components/schemas/CreditBlock'
        pagination_metadata:
          $ref: '#/components/schemas/PaginationMetadata'
    LedgerEntryCreate:
      type: object
      required:
      - entry_type
      properties:
        entry_type:
          type: string
          enum:
          - increment
          - decrement
          - expiration_change
          - void
          - amendment
        amount:
          type: number
        currency:
          type: string
        effective_date:
          type: string
          format: date-time
        expiry_date:
          type: string
          format: date-time
        per_unit_cost_basis:
          type: string
        description:
          type: string
    TopUpCreate:
      type: object
      required:
      - threshold
      - amount
      - currency
      - per_unit_cost_basis
      properties:
        threshold:
          type: string
          description: Trigger a top-up when the balance falls to or below this value.
        amount:
          type: string
          description: The number of credits to add per top-up.
        currency:
          type: string
        per_unit_cost_basis:
          type: string
        expires_after:
          type: integer
          nullable: true
        expires_after_unit:
          type: string
          enum:
          - day
          - month
          nullable: true
    TopUp:
      type: object
      properties:
        id:
          type: string
        threshold:
          type: string
        amount:
          type: string
        currency:
          type: string
        per_unit_cost_basis:
          type: string
        active_from:
          type: string
          format: date-time
          nullable: true
    LedgerEntry:
      type: object
      properties:
        id:
          type: string
        entry_type:
          type: string
          enum:
          - increment
          - decrement
          - expiration_change
          - credit_block_expiry
          - void
          - void_initiated
          - amendment
        entry_status:
          type: string
          enum:
          - committed
          - pending
        amount:
          type: number
        starting_balance:
          type: number
        ending_balance:
          type: number
        credit_block:
          $ref: '#/components/schemas/CreditBlock'
        description:
          type: string
          nullable: true
        created_at:
          type: string
          format: date-time
  parameters:
    Limit:
      name: limit
      in: query
      description: The number of items to return per page (default 20, max 100).
      schema:
        type: integer
        default: 20
        maximum: 100
    Cursor:
      name: cursor
      in: query
      description: An opaque cursor for the next page of results.
      schema:
        type: string
    CustomerId:
      name: customer_id
      in: path
      required: true
      description: The Orb-generated customer identifier.
      schema:
        type: string
  securitySchemes:
    bearerAuth:
      type: http
      scheme: bearer
      description: 'Authenticate with an Orb API key sent as a Bearer token in the Authorization header: `Authorization: Bearer <ORB_API_KEY>`.'