openapi: 3.1.0
info:
  title: Utility Accounting API
  description: UtilityAPI provides a REST API for collecting, standardizing, and sharing utility data including meters, bills, intervals, authorizations, and webhook events. Supports the Green Button standard for energy data sharing.
  version: '2'
  contact:
    name: UtilityAPI Support
    url: https://utilityapi.com/contact
  termsOfService: https://utilityapi.com/terms
servers:
- url: https://utilityapi.com/api/v2
  description: UtilityAPI Production Server
security:
- bearerAuth: []
tags:
- name: Accounting
  description: Customer billing accounts and billing summaries
paths:
  /accounting/billing-accounts:
    get:
      operationId: listBillingAccounts
      summary: List Billing Accounts
      description: List all customer billing accounts.
      tags:
      - Accounting
      parameters:
      - name: limit
        in: query
        required: false
        schema:
          type: integer
          default: 100
      - name: next
        in: query
        required: false
        schema:
          type: string
      responses:
        '200':
          description: List of billing accounts
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/BillingAccountList'
        '401':
          $ref: '#/components/responses/Unauthorized'
  /accounting/billing-accounts/{uid}:
    get:
      operationId: getBillingAccount
      summary: Get Billing Account
      description: Retrieve a specific billing account by UID.
      tags:
      - Accounting
      parameters:
      - $ref: '#/components/parameters/uid'
      responses:
        '200':
          description: Billing account details
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/BillingAccount'
        '401':
          $ref: '#/components/responses/Unauthorized'
        '404':
          $ref: '#/components/responses/NotFound'
  /accounting/billing-summaries:
    get:
      operationId: listBillingSummaries
      summary: List Billing Summaries
      description: List billing summaries for customer accounts.
      tags:
      - Accounting
      parameters:
      - name: limit
        in: query
        required: false
        schema:
          type: integer
          default: 100
      - name: next
        in: query
        required: false
        schema:
          type: string
      - name: billing_account_uid
        in: query
        description: Filter by billing account UID
        required: false
        schema:
          type: string
      responses:
        '200':
          description: List of billing summaries
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/BillingSummaryList'
        '401':
          $ref: '#/components/responses/Unauthorized'
  /accounting/billing-summaries/{uid}:
    get:
      operationId: getBillingSummary
      summary: Get Billing Summary
      description: Retrieve a specific billing summary by UID.
      tags:
      - Accounting
      parameters:
      - $ref: '#/components/parameters/uid'
      responses:
        '200':
          description: Billing summary details
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/BillingSummary'
        '401':
          $ref: '#/components/responses/Unauthorized'
        '404':
          $ref: '#/components/responses/NotFound'
components:
  schemas:
    BillingAccountList:
      type: object
      properties:
        billing_accounts:
          type: array
          items:
            $ref: '#/components/schemas/BillingAccount'
        next:
          type: string
    BillingAccount:
      type: object
      properties:
        uid:
          type: string
        name:
          type: string
        utility:
          type: string
        account_number:
          type: string
        status:
          type: string
        created:
          type: string
          format: date-time
    BillingSummaryList:
      type: object
      properties:
        billing_summaries:
          type: array
          items:
            $ref: '#/components/schemas/BillingSummary'
        next:
          type: string
    BillingSummary:
      type: object
      properties:
        uid:
          type: string
        billing_account_uid:
          type: string
        period_start:
          type: string
          format: date
        period_end:
          type: string
          format: date
        total_amount:
          type: number
        total_kwh:
          type: number
        currency:
          type: string
          default: USD
        created:
          type: string
          format: date-time
    Error:
      type: object
      properties:
        errors:
          type: array
          items:
            type: string
        status:
          type: string
  responses:
    NotFound:
      description: Resource not found
      content:
        application/json:
          schema:
            $ref: '#/components/schemas/Error'
    Unauthorized:
      description: Missing or invalid authentication token
      content:
        application/json:
          schema:
            $ref: '#/components/schemas/Error'
  parameters:
    uid:
      name: uid
      in: path
      required: true
      description: Unique identifier of the resource
      schema:
        type: string
  securitySchemes:
    bearerAuth:
      type: http
      scheme: bearer
      description: API token from the UtilityAPI dashboard
externalDocs:
  description: UtilityAPI Documentation
  url: https://utilityapi.com/docs