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

# Get customer by external ID

> Use when resolving a customer by your app's id (e.g. from your user table). Ideal for integrations that key by external id.



## OpenAPI

````yaml /api-reference/openapi.json get /customers/external/{external_id}
openapi: 3.0.1
info:
  title: Flexprice API
  description: Flexprice API Service
  contact:
    name: API Support
  license:
    name: AGPL-3.0
    url: https://www.gnu.org/licenses/agpl-3.0.html
  version: '1.0'
servers:
  - url: https://us.api.flexprice.io/v1
    description: US Region
  - url: https://api.cloud.flexprice.io/v1
    description: India Region
security: []
paths:
  /customers/external/{external_id}:
    get:
      tags:
        - Customers
      summary: Get customer by external ID
      description: >-
        Use when resolving a customer by your app's id (e.g. from your user
        table). Ideal for integrations that key by external id.
      operationId: getCustomerByExternalId
      parameters:
        - name: external_id
          in: path
          description: Customer External ID
          required: true
          schema:
            type: string
      responses:
        '200':
          description: OK
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/CustomerResponse'
        '400':
          description: Invalid request
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/errors.ErrorResponse'
        '404':
          description: Resource not found
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/errors.ErrorResponse'
        '500':
          description: Server error
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/errors.ErrorResponse'
      security:
        - ApiKeyAuth: []
components:
  schemas:
    CustomerResponse:
      type: object
      properties:
        address_city:
          type: string
          description: AddressCity is the city of the customer's address
        address_country:
          type: string
          description: >-
            AddressCountry is the country of the customer's address (ISO 3166-1
            alpha-2)
        address_line1:
          type: string
          description: AddressLine1 is the first line of the customer's address
        address_line2:
          type: string
          description: AddressLine2 is the second line of the customer's address
        address_postal_code:
          type: string
          description: AddressPostalCode is the postal code of the customer's address
        address_state:
          type: string
          description: AddressState is the state of the customer's address
        created_at:
          type: string
          format: date-time
        created_by:
          type: string
        email:
          type: string
          description: Email is the email of the customer
        environment_id:
          type: string
          description: EnvironmentID is the environment identifier for the customer
        external_id:
          type: string
          description: ExternalID is the external identifier for the customer
        id:
          type: string
          description: ID is the unique identifier for the customer
        integrations:
          type: array
          items:
            $ref: '#/components/schemas/EntityIntegrationMappingResponse'
        metadata:
          type: object
          additionalProperties:
            type: string
          description: Metadata
        name:
          type: string
          description: Name is the name of the customer
        status:
          $ref: '#/components/schemas/types.Status'
        tenant_id:
          type: string
        updated_at:
          type: string
          format: date-time
        updated_by:
          type: string
      description: Customer response object containing all customer information
    errors.ErrorResponse:
      type: object
      properties:
        code:
          type: string
          enum:
            - not_found
            - already_exists
            - version_conflict
            - validation_error
            - invalid_operation
            - permission_denied
            - http_client_error
            - database_error
            - system_error
            - internal_error
            - service_unavailable
        details:
          type: object
          additionalProperties:
            type: object
        http_status_code:
          type: integer
        message:
          type: string
      x-speakeasy-name-override: ErrorResponse
    EntityIntegrationMappingResponse:
      type: object
      properties:
        created_at:
          type: string
          format: date-time
        created_by:
          type: string
        entity_id:
          type: string
        entity_type:
          $ref: '#/components/schemas/types.IntegrationEntityType'
        environment_id:
          type: string
        id:
          type: string
        provider_entity_id:
          type: string
        provider_type:
          type: string
        status:
          $ref: '#/components/schemas/types.Status'
        tenant_id:
          type: string
        updated_at:
          type: string
          format: date-time
        updated_by:
          type: string
    types.Status:
      type: string
      enum:
        - published
        - deleted
        - archived
      x-enum-varnames:
        - StatusPublished
        - StatusDeleted
        - StatusArchived
      x-speakeasy-name-override: Status
    types.IntegrationEntityType:
      type: string
      enum:
        - customer
        - plan
        - invoice
        - subscription
        - payment
        - credit_note
        - addon
        - item
        - item_price
        - price
      x-enum-varnames:
        - IntegrationEntityTypeCustomer
        - IntegrationEntityTypePlan
        - IntegrationEntityTypeInvoice
        - IntegrationEntityTypeSubscription
        - IntegrationEntityTypePayment
        - IntegrationEntityTypeCreditNote
        - IntegrationEntityTypeAddon
        - IntegrationEntityTypeItem
        - IntegrationEntityTypeItemPrice
        - IntegrationEntityTypePrice
      x-speakeasy-name-override: IntegrationEntityType
  securitySchemes:
    ApiKeyAuth:
      type: apiKey
      description: Enter your API key in the format *x-api-key <api-key>**
      name: x-api-key
      in: header

````