> ## Documentation Index > Fetch the complete documentation index at: https://help.dingtalk.io/llms.txt > Use this file to discover all available pages before exploring further. # Server-Side Open APIs > Learn about the capabilities and entry points of YiDA server-side open APIs, and follow this guide to complete server-side integration through the DingTalk Open Platform for backend read and write operations on form data. In addition to open APIs for client-side calls, the YiDA platform also provides open APIs that support server-side calls. For details, see the [DingTalk Open Platform documentation](https://open.dingtalk.com/document/orgapp-server/yida-overview). ## User Guide Follow the steps below to use the YiDA server-side open APIs: The DingTalk Open Platform offers multiple app types, and the way you use server-side open APIs varies by app type. For details, see [Introduction to DingTalk App Types](https://open.dingtalk.com/document/orgapp/untitled-document-1689231271995). ### Step 1: Create a DingTalk App * To create an internal app, see [Internal App Development Process Overview](https://open.dingtalk.com/document/orgapp/overview-of-development-process). * To create a third-party enterprise app, see [Third-Party Enterprise App Overview](https://open.dingtalk.com/document/isvapp/isv-cooperation-guide). ### Step 2: Add API Call Permissions After the app is created, only sign-in and message notification APIs are enabled by default. Add the required API permissions based on your development needs. * For internal apps, see [Add API Call Permissions](/open/development/add-api-permission). * For third-party enterprise apps, see [Add API Call Permissions](https://open.dingtalk.com/document/isvapp-server/add-interface-call-permissions?#topic-2149187). ### Step 3: Obtain the access\_token for the App The access\_token serves as an identity credential. When calling an API, use the access\_token to authenticate the caller's identity. * For internal apps, see [Obtain the access\_token of an Internal App](https://open.dingtalk.com/document/orgapp-server/obtain-the-access_token-of-an-internal-app#topic-2056397). * For third-party enterprise apps, see [Obtain the access\_token of the Authorized Enterprise](https://open.dingtalk.com/document/isvapp-server/obtain-the-access_token-of-the-authorized-enterprise?#topic-2056409). ## API List ### Workflow | API Description | Internal app | Third-party enterprise app | Third-party personal app | Permissions | | :------------------------------------------------------------------------------------------------------------- | :----------- | :------------------------- | :----------------------- | :---------------------------------- | | [Start a YiDA approval process](https://open.dingtalk.com/document/orgapp/api-startinstance-v2) | Supported | Supported | Not supported | YiDA workflow data write permission | | [Delete a workflow instance](https://open.dingtalk.com/document/orgapp-server/delete-process-instance) | Supported | Supported | Not supported | YiDA workflow data write permission | | [Terminate a workflow instance](https://open.dingtalk.com/document/orgapp-server/terminate-a-process-instance) | Supported | Supported | Not supported | YiDA workflow data write permission | ### Form | API Description | Internal app | Third-party enterprise app | Third-party personal app | Permissions | | :-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | :----------- | :------------------------- | :----------------------- | :------------------------------ | | [Query form instance data](https://open.dingtalk.com/document/orgapp/api-searchformdatas-v2) | Supported | Supported | Not supported | YiDA form data read permission | | [Save form data](https://open.dingtalk.com/document/orgapp/api-saveformdata-v2) | Supported | Supported | Not supported | YiDA form data write permission | | [Update form data](https://open.dingtalk.com/document/orgapp/api-updateformdata-v2) | Supported | Supported | Not supported | YiDA form data write permission | | [Query form data](https://open.dingtalk.com/document/orgapp/api-getformdatabyid-v2) | Supported | Supported | Not supported | YiDA form data read permission | | [Get the value of an employee component](https://open.dingtalk.com/document/orgapp/gets-the-value-of-the-employee-component) | Supported | Supported | Not supported | YiDA form data read permission | | [Get the form component definition list](https://open.dingtalk.com/document/orgapp/get-a-list-of-form-component-definitions) | Supported | Supported | Not supported | YiDA form data read permission | | [Get subform component data](https://open.dingtalk.com/document/orgapp/obtain-child-table-component-data) | Supported | Supported | Not supported | YiDA form data read permission | | [Delete form data](https://open.dingtalk.com/document/orgapp/delete-form-data) | Supported | Supported | Not supported | YiDA form data write permission | | [Get multiple form instance IDs](https://open.dingtalk.com/document/orgapp/api-searchformdataidlist-v2) | Supported | Supported | Not supported | YiDA form data read permission | | [Get form instance data in batch](https://open.dingtalk.com/document/orgapp/obtain-multiple-form-instance-data) | Supported | Supported | Not supported | YiDA form data read permission | | [Delete form instances in batch](https://open.dingtalk.com/document/orgapp/delete-multiple-form-instances) | Supported | Supported | Not supported | YiDA form data read permission | | [Create form instances in batch](https://open.dingtalk.com/document/orgapp/create-multiple-form-instances) | Supported | Supported | Not supported | YiDA form data read permission | | [Update component values within form instances in batch](https://open.dingtalk.com/document/orgapp/batch-update-of-component-values-in-form-instances) | Supported | Supported | Not supported | YiDA form data read permission | | [Create or update a form instance](https://open.dingtalk.com/document/orgapp/api-createorupdateformdata-v2) | Supported | Supported | Not supported | YiDA form data read permission | | [Get form instance data by advanced query conditions (including subform component data)](https://open.dingtalk.com/document/orgapp/api-searchformdatasecondgeneration-v2) | Supported | Supported | Not supported | YiDA form data read permission | | [Get form instance data by advanced query conditions (excluding subform component data)](https://open.dingtalk.com/document/orgapp/obtain-form-instance-data-using-advanced-query-conditions-excluding-subform) | Supported | Supported | Not supported | YiDA form data write permission | | [Update form instances in batch using form instance data](https://open.dingtalk.com/document/orgapp/update-multiple-form-instances-with-the-form-instance-data) | Supported | Supported | Not supported | YiDA form data write permission | | [Query form change records](https://open.dingtalk.com/document/orgapp/change-records-of-query-forms) | Supported | Supported | Not supported | YiDA form data write permission | | [Get the workflow design structure](https://open.dingtalk.com/document/orgapp/api-getprocessdesign) | Supported | Supported | Not supported | YiDA form data write permission | | [Get the component alias list](https://open.dingtalk.com/document/orgapp/api-getformcomponentaliaslist) | Supported | Supported | Not supported | YiDA form data write permission | ### Task | API Description | Internal app | Third-party enterprise app | Third-party personal app | Permissions | | :----------------------------------------------------------------------------------------------------------------------------------------------------------- | :----------- | :------------------------- | :----------------------- | :---------------------------------- | | [Get approval records](https://open.dingtalk.com/document/orgapp/queries-an-approval-record) | Supported | Supported | Not supported | YiDA workflow data read permission | | [Accept or decline a YiDA approval task](https://open.dingtalk.com/document/orgapp/execute-approval-tasks) | Supported | Supported | Not supported | YiDA workflow data write permission | | [Get tasks submitted by a user within the organization](https://open.dingtalk.com/document/orgapp/obtains-the-tasks-submitted-by-someone-in-an-organization) | Supported | Supported | Not supported | YiDA workflow data read permission | | [Get completed approval tasks in the organization](https://open.dingtalk.com/document/orgapp/obtains-the-completed-approval-tasks-in-an-organization) | Supported | Supported | Not supported | YiDA task read permission | | [Transfer a task](https://open.dingtalk.com/document/orgapp/transfer-tasks) | Supported | Supported | Not supported | YiDA task write permission | | [Query running workflow tasks (VPC)](https://open.dingtalk.com/document/orgapp/query-process-running-tasks-vpc) | Supported | Supported | Not supported | YiDA task read permission | | [Get the task list (organization scope)](https://open.dingtalk.com/document/orgapp/query-tasks-from-the-organization-dimension) | Supported | Supported | Not supported | YiDA task read permission | | [Get notifications sent to a user](https://open.dingtalk.com/document/orgapp/get-notifications-sent-to-users) | Supported | Supported | Not supported | YiDA task read permission | | [Query the task list of items CC'd to me (app scope)](https://open.dingtalk.com/document/orgapp/query-copied-my-task-list-application-dimension) | Supported | Supported | Not supported | YiDA task read permission | | [Submit a comment](https://open.dingtalk.com/document/orgapp/submit-comment) | Supported | Supported | Not supported | YiDA comment write permission | | [Execute YiDA approval tasks in batch](https://open.dingtalk.com/document/orgapp/batch-execution-should-take-the-lead-of-approval-tasks) | Supported | Supported | Not supported | YiDA comment write permission | | [Query comments on YiDA form instances in batch](https://open.dingtalk.com/document/orgapp/batch-query-of-comments-appropriate-for-form-instances) | Supported | Supported | Not supported | YiDA comment write permission | ### Attachment | API Description | Internal app | Third-party enterprise app | Third-party personal app | Permissions | | :------------------------------------------------------------------------------------------------------------------------------------------------------------------ | :----------- | :------------------------- | :----------------------- | :--------------------------------- | | [Get the temporary silent login URL of a YiDA attachment](https://open.dingtalk.com/document/orgapp/obtain-the-temporary-free-access-address-of-yixian-accessories) | Supported | Supported | Not supported | YiDA workflow data read permission |