> ## Documentation Index > Fetch the complete documentation index at: https://developers.hubspot.com/docs/llms.txt > Use this file to discover all available pages before exploring further. # Migrate CRM card views > Swaps a Legacy CRM Card with an App Card in views. Reference the "Migrate a legacy CRM card to an app card" docs for more information > [accordion] Supported products ## OpenAPI ````yaml specs/2026-09/crm-public-app-crm-cards-v2026-09.json POST /crm/extensions/cards-dev/2026-09/{appId}/views/migrate openapi: 3.0.1 info: title: Public App Crm Cards description: Basepom for all HubSpot Projects version: 2026-09 x-hubspot-product-tier-requirements: marketing: FREE sales: FREE service: FREE cms: FREE commerce: FREE crmHub: FREE dataHub: FREE x-hubspot-api-use-case: >- Add a custom card to contact records that displays data from your external bug tracking software. x-hubspot-introduction: >- Create custom cards to data from external systems on CRM records. Requires a public public app. These CRM cards are different from the UI extensions you can create with projects. servers: - url: https://api.hubapi.com security: [] tags: - name: Advanced - name: Basic paths: /crm/extensions/cards-dev/2026-09/{appId}/views/migrate: post: tags: - Advanced summary: Migrate Card Views description: >- Swaps a Legacy CRM Card with an App Card in views. Reference the "Migrate a legacy CRM card to an app card" docs for more information operationId: >- post-/crm/extensions/cards-dev/2026-09/{appId}/views/migrate_/crm/v3/extensions/cards-dev/{appId}/views/migrate parameters: - name: appId in: path description: The unique identifier of the app for which views are being migrated. required: true style: simple explode: false schema: type: integer format: int32 requestBody: content: application/json: schema: $ref: '#/components/schemas/CardMigrateViewsRequest' required: true responses: '200': description: successful operation content: application/json: schema: $ref: '#/components/schemas/CardMigrateViewsResponse' default: $ref: '#/components/responses/Error' description: '' security: - developer_hapikey: [] components: schemas: CardMigrateViewsRequest: required: - allowDuplicateAppCardIds - appCardId - legacyCrmCardId type: object properties: allowDuplicateAppCardIds: type: boolean description: >- A boolean flag indicating whether duplicate app card IDs are allowed during the migration process. appCardId: type: integer description: >- The unique identifier for the new app card to which views will be migrated. This is an integer in int64 format. format: int64 helpdeskAppCardId: type: integer description: >- The unique identifier for the helpdesk app card, if applicable. This is an integer in int64 format. format: int64 legacyCrmCardId: type: integer description: >- The unique identifier for the legacy CRM card. This is an integer in int64 format. format: int64 tabAppCardId: type: integer format: int64 CardMigrateViewsResponse: required: - message type: object properties: endedAt: type: integer description: The timestamp for when the migration ended. format: int64 message: type: string description: A human readable message describing the progress of the migration. remainingPortalCount: type: integer description: >- The number of portals that remain to be swapped from the Legacy CRM Card to the App Card format: int64 startedAt: type: integer description: The timestamp for when the migration started. format: int64 totalPortalCount: type: integer description: The total number of portals that have access to the Legacy CRM Card format: int64 Error: required: - category - correlationId - message type: object properties: category: type: string description: The error category context: type: object additionalProperties: type: array items: type: string description: Context about the error condition example: >- {invalidPropertyName=[propertyValue], missingScopes=[scope1, scope2]} correlationId: type: string description: >- A unique identifier for the request. Include this value with any error reports or support tickets format: uuid example: aeb5f871-7f07-4993-9211-075dc63e7cbf errors: type: array description: further information about the error items: $ref: '#/components/schemas/ErrorDetail' links: type: object additionalProperties: type: string description: >- A map of link names to associated URIs containing documentation about the error or recommended remediation steps message: type: string description: >- A human readable message describing the error along with remediation steps where appropriate example: An error occurred subCategory: type: string description: >- A specific category that contains more specific detail about the error description: >- Represents an error response returned by the API when an operation fails. This component is used in various endpoints to provide detailed information about the error encountered. example: message: Invalid input (details will vary based on the error) correlationId: aeb5f871-7f07-4993-9211-075dc63e7cbf category: VALIDATION_ERROR links: knowledge-base: https://www.hubspot.com/products/service/knowledge-base ErrorDetail: required: - message type: object properties: code: type: string description: The status code associated with the error detail context: type: object additionalProperties: type: array items: type: string description: Context about the error condition example: '{missingScopes=[scope1, scope2]}' in: type: string description: The name of the field or parameter in which the error was found. message: type: string description: >- A human readable message describing the error along with remediation steps where appropriate subCategory: type: string description: >- A specific category that contains more specific detail about the error description: >- Represents detailed information about an error that occurred in the API. This component is used to provide additional context and specifics about errors, typically as part of an error response. responses: Error: description: An error occurred. content: '*/*': schema: $ref: '#/components/schemas/Error' securitySchemes: developer_hapikey: type: apiKey name: hapikey in: query ````