Table of Contents

    API-based Integration Basics

    Rumman Ansari June 08, 2026 12 views Subject Details

    API-based Integration Basics in Microsoft Power Platform

    API-based integration is an important concept in Microsoft Power Platform because many real-world systems need to communicate with external applications, databases, web services, and business platforms. When a ready-made connector is not available, or when a solution needs more control over data exchange, APIs can be used to connect Power Apps, Power Automate, Copilot Studio, Dataverse, and external systems.

    Microsoft documentation explains that HTTP connectors in Power Automate use Representational State Transfer, or REST architecture, allowing users to interact directly with data by using web requests. It also states that HTTP connectors allow flow makers to use web service offerings in a secure manner while still using Power Automate flows. [1](https://learn.microsoft.com/en-us/training/modules/http-connectors/)

    In simple words, API-based integration means connecting two software systems through an API so they can exchange data or perform actions. For example, Power Automate can call an external API to get weather data, submit an order, check payment status, retrieve employee details, or update data in another system.

    1. What is an API?

    An API, or Application Programming Interface, is a way for one software system to communicate with another software system. It defines what requests can be made, what data should be sent, what response will be returned, and how authentication should happen.

    In Power Platform, APIs are commonly used when a maker or developer needs to connect to a service that does not already have a ready-made connector, or when a custom business system exposes data through web endpoints. Microsoft documentation explains that custom connectors are useful when users want to communicate with services that are not available as prebuilt connectors. [2](https://community.dynamics.com/blogs/post/?postid=aa9407d5-06b5-40ea-87aa-52e239631f39)

    API Concept Simple Meaning Example
    API A communication interface between software systems. Power Automate calls an HR API to get employee details.
    Endpoint A specific URL where an API operation is available. /employees, /orders, /customers
    Request The message sent to the API. Get all pending orders.
    Response The message returned by the API. List of pending orders in JSON format.
    Authentication Security process used to verify API access. API key, OAuth, Microsoft Entra ID.

    2. Why API-based Integration is Needed

    Power Platform already provides many prebuilt connectors, but every business system may not have a ready-made connector. Internal HR systems, payroll systems, logistics platforms, legacy ERP systems, payment gateways, and niche third-party services often expose APIs for integration.

    Microsoft documentation explains that Power Automate, Power Apps, Azure Logic Apps, and Copilot Studio offer many connectors, but custom connectors address scenarios where users need to communicate with services that are not available as prebuilt connectors. [2](https://community.dynamics.com/blogs/post/?postid=aa9407d5-06b5-40ea-87aa-52e239631f39)

    Need Explanation Example
    No Prebuilt Connector The required system may not have a ready-made Power Platform connector. Company internal payroll API.
    Custom Business Logic The API may expose specific business actions. Calculate shipping price from logistics API.
    Real-Time Data The app or flow may need fresh data from an external system. Check live order status from e-commerce API.
    System-to-System Communication Power Platform can exchange data with external systems. Power Automate sends approved invoice data to ERP.
    Reusable Integration API logic can be wrapped inside a custom connector for reuse. Reusable HR API custom connector.

    3. What is REST API?

    A REST API is a common style of web API that uses standard HTTP requests to access and manipulate data. Microsoft documentation explains that HTTP connectors use REST architecture, allowing users to interact directly with data by using web requests. [1](https://learn.microsoft.com/en-us/training/modules/http-connectors/)

    REST APIs are widely used because they are simple, web-friendly, and usually exchange data in JSON format. In Power Platform, REST APIs are commonly accessed using the HTTP action in Power Automate or through a custom connector.

    REST API Element Meaning Example
    HTTP Method Defines the operation type. GET, POST, PATCH, DELETE
    URL / Endpoint The address of the API operation. /api/customers
    Headers Extra information sent with the request. Authorization token, Content-Type
    Body Data sent to the API for create or update operations. Customer details in JSON
    Response Data returned by the API. Success message or returned records

    4. Common HTTP Methods

    HTTP methods define what kind of operation the API should perform. Microsoft Dataverse Web API documentation explains that Dataverse Web API presents operations in RESTful style and that CRUD operations use GET, POST, PATCH, and DELETE HTTP methods. [3](https://learn.microsoft.com/en-us/power-apps/developer/data-platform/webapi/overview)

    HTTP Method Purpose Business Example
    GET Retrieve data from an API. Get all customers from a CRM API.
    POST Create new data or submit information. Create a new order in an external system.
    PATCH Partially update existing data. Update only order status.
    PUT Replace or update an existing resource. Update full customer profile.
    DELETE Delete data from a system. Delete a temporary record.

    5. API Request and Response

    In API-based integration, one system sends a request and another system returns a response. The request usually contains the HTTP method, endpoint URL, headers, authentication details, and sometimes a body. The response usually contains a status code and data, often in JSON format.

    Part Description Example
    Request URL The API endpoint address. https://api.example.com/orders
    Method The operation to perform. GET or POST
    Headers Metadata and authentication information. Authorization: Bearer token
    Body Payload sent to the API. {"name":"Rumman","department":"IT"}
    Status Code Indicates success or failure. 200, 201, 400, 401, 500
    Response Body Data returned by the API. Customer list or success message.

    6. Common API Status Codes

    Status codes help identify whether an API request succeeded or failed. These are general web API concepts and should be interpreted according to the API provider’s documentation.

    Status Code Meaning Simple Explanation
    200 OK The request was successful.
    201 Created A new resource was created successfully.
    400 Bad Request The request was incorrect or missing required data.
    401 Unauthorized Authentication is missing or invalid.
    403 Forbidden The user or app does not have permission.
    404 Not Found The requested resource was not found.
    500 Server Error The API server failed to process the request.

    7. JSON in API Integration

    JSON is commonly used in API request and response bodies. It is easy for applications to read and write. In Power Automate, API responses are often parsed using JSON-related actions so that returned values can be used in later flow steps.

    Example JSON Request Body

    {
    "employeeName": "Rumman Ansari",
    "department": "IT",
    "status": "Active"
}

    Example JSON Response Body

    {
    "employeeId": 101,
    "employeeName": "Rumman Ansari",
    "message": "Employee created successfully"
}
    JSON Element Meaning Example
    Key Name of the data property. employeeName
    Value Actual data assigned to the key. Rumman Ansari
    Object Group of key-value pairs. { "status": "Active" }
    Array List of values or objects. [{"id":1},{"id":2}]

    8. Authentication in API-based Integration

    APIs usually require authentication to prevent unauthorized access. Microsoft custom connector documentation describes API security options such as generic OAuth 2.0, OAuth 2.0 for specific services, Basic authentication, and API Key. It also states that Microsoft Entra ID is recommended among standard authentication methods for APIs and connectors. [2](https://community.dynamics.com/blogs/post/?postid=aa9407d5-06b5-40ea-87aa-52e239631f39)

    Authentication Type Meaning Example
    API Key A secret key sent with API requests. x-api-key: ABC123
    Basic Authentication Username and password-based authentication. Used by some legacy APIs.
    OAuth 2.0 Token-based secure authentication. Sign in and use access token.
    Microsoft Entra ID Microsoft identity-based authentication. Secure enterprise API access.
    No Authentication API is publicly accessible. Public demo API, if allowed by provider.

    9. API Integration in Power Automate

    Power Automate can call APIs using HTTP-related connectors and actions. Microsoft training documentation explains that HTTP connectors in Power Automate use REST architecture and allow users to interact directly with data using web requests. [1](https://learn.microsoft.com/en-us/training/modules/http-connectors/)

    Power Automate API Area Description Example
    HTTP Action Used to send web requests to APIs. Call shipment tracking API.
    Request Body Data sent to API for POST or PATCH operations. Send customer details in JSON.
    Headers Used for content type and authentication. Authorization header.
    Parse Response Use returned API data in later flow steps. Use returned order status in an email.

    Example: Conceptual API Call in Power Automate

    Method: GET
URL: https://api.example.com/orders/1001
Headers:
    Authorization: Bearer 
    Accept: application/json

    This is a teaching example to explain API request structure. Actual URL, authentication, and headers depend on the API provider’s documentation.

    10. API Integration in Power Apps

    Power Apps can use APIs through custom connectors. Microsoft documentation explains that a custom connector is a wrapper around a REST API that allows Logic Apps, Power Automate, Power Apps, or Copilot Studio to communicate with that REST or SOAP API. [2](https://community.dynamics.com/blogs/post/?postid=aa9407d5-06b5-40ea-87aa-52e239631f39)

    Power Apps API Scenario How API is Used Example
    Display External Data Custom connector retrieves API data into the app. Show shipment status in Power App.
    Submit Data to External System Power App calls custom connector action. Submit customer request to external CRM API.
    Validate Data API checks data and returns result. Validate GST number or employee code.
    Search External System App sends search parameter to API. Search product catalog from external API.

    11. Custom Connectors for API Integration

    Custom connectors make APIs easier to reuse in Power Apps, Power Automate, Copilot Studio, and Azure Logic Apps. Microsoft documentation explains that custom connectors are useful when users need to communicate with services that are not available as prebuilt connectors. It also states that a custom connector is a wrapper around a REST API or SOAP API. [2](https://community.dynamics.com/blogs/post/?postid=aa9407d5-06b5-40ea-87aa-52e239631f39)

    Microsoft documentation also explains that to create a custom connector, you must describe the API so that the connector understands the API’s operations and data structures. It says this can be done using an OpenAPI definition. [4](https://learn.microsoft.com/en-us/connectors/custom-connectors/define-openapi-definition)

    Custom Connector Area Description Example
    API Definition Describes API operations and structures. OpenAPI/Swagger file.
    Authentication Defines how users connect securely. API Key or OAuth 2.0.
    Actions API operations exposed to Power Platform. Get Employee, Create Order.
    Testing Validate API calls before using in apps or flows. Test Get Customer action.

    12. OpenAPI and Swagger

    OpenAPI is a machine-readable description of an API. Microsoft documentation explains that an OpenAPI definition file is a language-agnostic, machine-readable document that describes API operations and parameters. [5](https://make.powerautomate.com/documentation/customapi-how-to-swagger/)

    Microsoft documentation for custom connectors also states that when creating a custom connector from an OpenAPI definition, the OpenAPI definition must be in OpenAPI 2.0 format, formerly known as Swagger, and must be less than 1 MB. [4](https://learn.microsoft.com/en-us/connectors/custom-connectors/define-openapi-definition)

    Term Meaning Why It Matters
    OpenAPI Standard document that describes API operations and parameters. Helps create custom connectors faster.
    Swagger Older/common name associated with OpenAPI 2.0 format. Used by many APIs to describe endpoints.
    API Definition Machine-readable API description. Connector understands actions and data structures.

    13. Dataverse Web API

    Microsoft Dataverse also provides a Web API. Microsoft documentation states that Dataverse Web API can be used to work with data, table definitions, and column definitions in Dataverse. It also states that Dataverse Web API provides a development experience across a wide variety of programming languages, platforms, and devices. [3](https://learn.microsoft.com/en-us/power-apps/developer/data-platform/webapi/overview)

    Microsoft documentation explains that the Dataverse Web API implements OData version 4.0, an OASIS standard for building and consuming RESTful APIs over rich data sources. It also states that users can use the Web API with any language that allows authenticated HTTP requests. [3](https://learn.microsoft.com/en-us/power-apps/developer/data-platform/webapi/overview)

    Dataverse Web API Capability Description Example
    Work with Data Use API to create, retrieve, update, or delete Dataverse records. Create account record from external app.
    Work with Metadata Access table and column definitions. Read table schema information.
    Cross-Platform Access Use different languages and platforms to call Dataverse. JavaScript, C#, PowerShell, or other HTTP-capable tools.
    RESTful Style Uses HTTP requests and REST-style operations. GET records, POST create, PATCH update, DELETE remove.

    14. API-based Integration Architecture

    A basic API integration architecture includes a source system, API endpoint, connector or HTTP action, Power Platform solution, authentication, and response processing.

    Architecture Component Purpose Example
    Power App / Flow Initiates the integration or uses returned data. Power App searches employee information.
    HTTP Action / Custom Connector Sends API request and receives response. Call HR API endpoint.
    Authentication Secures the API call. OAuth token or API key.
    External API Provides external service or data. Payroll system API.
    Response Processing Uses returned data in app or flow. Display salary status or update Dataverse row.

    15. API-based Integration Use Cases

    Use Case API Integration Design Example
    Order Tracking Call courier tracking API. Show delivery status in Power App.
    Payment Verification Call payment gateway API. Check whether payment is successful.
    Employee Lookup Call internal HR API. Retrieve employee manager and department.
    Customer Validation Call external verification API. Validate customer tax or registration number.
    Dataverse Integration Use Dataverse Web API. Create or update Dataverse records from external system.

    16. Power Automate API Flow Example

    Below is a conceptual API-based flow design for teaching purposes.

    Flow Step Action Purpose
    Step 1 Manual trigger or Dataverse trigger Start the flow.
    Step 2 HTTP action Call external API.
    Step 3 Parse JSON Extract values from API response.
    Step 4 Condition Check response status or returned value.
    Step 5 Update row / Send email / Post Teams message Perform business action based on response.

    17. API Security Best Practices

    Best Practice Explanation Example
    Use secure authentication Protect APIs with OAuth, API key, or Microsoft Entra ID where suitable. Use OAuth 2.0 for enterprise API.
    Do not expose secrets API keys and tokens should not be hardcoded in visible places. Store secrets securely according to organizational policy.
    Use HTTPS API communication should be encrypted. Call https:// endpoint only.
    Follow least privilege API credentials should have only required permissions. Read-only key for read-only integration.
    Handle errors API failures should be logged or handled properly. Notify admin when API returns 500.

    18. API Integration Best Practices

    Best Practice Explanation Example
    Read API documentation Understand endpoint, authentication, parameters, request body, and response. Check API provider docs before building flow.
    Use custom connector for reusable APIs Reusable API logic should be wrapped into custom connector. HR API custom connector used in many apps.
    Validate responses Check whether API returned expected data. Check status code before updating Dataverse.
    Use clear naming API actions should be named clearly in connectors and flows. Get Employee Details, Create Ticket.
    Monitor failures API calls can fail due to downtime, invalid tokens, or bad requests. Log failed API response in Dataverse.
    Plan for limits APIs may have throttling or request limits. Avoid calling API unnecessarily in loops.

    19. Common Mistakes in API-based Integration

    Mistake Problem Better Approach
    Ignoring authentication API calls fail with unauthorized errors. Configure correct authentication method.
    Hardcoding API keys Security risk and difficult maintenance. Use secure secret management based on organization policy.
    Not checking status code Flow may continue even after API failure. Add condition to verify success response.
    Not parsing JSON correctly Returned values cannot be used properly. Use proper JSON schema and test responses.
    Calling API too frequently May hit API limits or reduce performance. Use filters, batching, or scheduled calls where appropriate.
    No documentation Future maintenance becomes difficult. Document endpoint, method, authentication, and response schema.

    20. Mini Project: API-based Order Status Checker

    Project Objective

    Create a Power Automate flow or Power App that checks order status from an external API and updates a Dataverse or SharePoint record.

    Project Design

    Component Purpose Example
    Power App User enters order number. Order ID: 1001
    Power Automate Flow Calls external order API. HTTP GET request.
    External API Returns order status. Shipped, Pending, Delivered.
    Dataverse / SharePoint Stores updated order status. Update request record.
    Notification Sends result to user. Email or Teams message.

    Learning Outcome

    • Students understand API endpoint, method, headers, and response.
    • Students learn how Power Automate can call an external API.
    • Students learn how API response data can update business records.
    • Students understand why authentication and error handling are important.

    21. Interview Questions and Answers

    Q1. What is API-based integration?

    API-based integration means connecting systems through APIs so they can exchange data or perform operations. In Power Platform, it is commonly done using HTTP actions, custom connectors, or Dataverse Web API.

    Q2. What is a REST API?

    A REST API is a web API style that uses HTTP requests. Microsoft documentation states that HTTP connectors in Power Automate use REST architecture and allow users to interact directly with data by using web requests. [1](https://learn.microsoft.com/en-us/training/modules/http-connectors/)

    Q3. What are common HTTP methods used in API integration?

    Common methods include GET, POST, PATCH, PUT, and DELETE. Microsoft Dataverse Web API documentation states that RESTful CRUD operations use GET, POST, PATCH, and DELETE HTTP methods. [3](https://learn.microsoft.com/en-us/power-apps/developer/data-platform/webapi/overview)

    Q4. What is the role of HTTP action in Power Automate?

    HTTP actions allow Power Automate flows to interact with APIs using web requests. Microsoft training documentation says HTTP connectors allow users to interact directly with data using web requests. [1](https://learn.microsoft.com/en-us/training/modules/http-connectors/)

    Q5. What is a custom connector?

    Microsoft documentation defines a custom connector as a wrapper around a REST API that allows Logic Apps, Power Automate, Power Apps, or Copilot Studio to communicate with that REST or SOAP API. [2](https://community.dynamics.com/blogs/post/?postid=aa9407d5-06b5-40ea-87aa-52e239631f39)

    Q6. Why do we use custom connectors?

    Custom connectors are used when a needed service is not available as a prebuilt connector. Microsoft documentation states that custom connectors address scenarios where users need to communicate with services that are not available as prebuilt connectors. [2](https://community.dynamics.com/blogs/post/?postid=aa9407d5-06b5-40ea-87aa-52e239631f39)

    Q7. What is OpenAPI?

    Microsoft documentation explains that an OpenAPI definition file is a language-agnostic, machine-readable document that describes API operations and parameters. [5](https://make.powerautomate.com/documentation/customapi-how-to-swagger/)

    Q8. What is Dataverse Web API?

    Dataverse Web API is used to work with Dataverse data and table/column definitions. Microsoft documentation states that Dataverse Web API provides a development experience across many programming languages, platforms, and devices. [3](https://learn.microsoft.com/en-us/power-apps/developer/data-platform/webapi/overview)

    Q9. What authentication types are commonly used for APIs?

    Microsoft custom connector documentation lists authentication methods such as generic OAuth 2.0, OAuth 2.0 for specific services, Basic authentication, API Key, and Microsoft Entra ID. [2](https://community.dynamics.com/blogs/post/?postid=aa9407d5-06b5-40ea-87aa-52e239631f39)

    Q10. What is the difference between HTTP action and custom connector?

    An HTTP action is commonly used directly inside a flow for API calls. A custom connector wraps API operations into reusable actions that can be used across Power Apps, Power Automate, Copilot Studio, and Logic Apps. The custom connector definition is supported by Microsoft documentation describing custom connectors as wrappers around REST or SOAP APIs. [2](https://community.dynamics.com/blogs/post/?postid=aa9407d5-06b5-40ea-87aa-52e239631f39)

    22. Student-Friendly Summary

    Concept Easy Meaning Example
    API A way for two systems to communicate. Power Automate talks to order system.
    REST API API style using HTTP web requests. GET order status from API.
    Endpoint Specific API URL. /orders/1001
    HTTP Method Operation type. GET, POST, PATCH, DELETE.
    JSON Common data format used by APIs. { "status": "Approved" }
    Authentication Security check for API access. OAuth token or API key.
    Custom Connector Reusable wrapper around an API. HR API connector.

    23. Quick Revision Points

    • API-based integration connects Power Platform with external services and systems.
    • HTTP connectors in Power Automate use REST architecture and web requests. [1](https://learn.microsoft.com/en-us/training/modules/http-connectors/)
    • RESTful operations commonly use HTTP methods such as GET, POST, PATCH, and DELETE. [3](https://learn.microsoft.com/en-us/power-apps/developer/data-platform/webapi/overview)
    • API requests usually include endpoint URL, method, headers, authentication, and sometimes body data.
    • API responses usually include status code and response body.
    • JSON is commonly used for API request and response payloads.
    • Custom connectors are wrappers around REST or SOAP APIs. [2](https://community.dynamics.com/blogs/post/?postid=aa9407d5-06b5-40ea-87aa-52e239631f39)
    • OpenAPI definitions describe API operations and parameters. [5](https://make.powerautomate.com/documentation/customapi-how-to-swagger/)
    • Dataverse Web API supports RESTful access to Dataverse data and metadata. [3](https://learn.microsoft.com/en-us/power-apps/developer/data-platform/webapi/overview)
    • API integrations should include authentication, error handling, logging, and documentation.

    Conclusion

    API-based integration is a key skill for Microsoft Power Platform makers and developers. It allows Power Apps, Power Automate, Copilot Studio, Dataverse, and external systems to communicate with each other through web APIs.

    Power Automate can use HTTP connectors to interact directly with data using REST-based web requests. Microsoft documentation confirms that HTTP connectors use REST architecture and allow users to interact directly with data through web requests. [1](https://learn.microsoft.com/en-us/training/modules/http-connectors/)

    Custom connectors make API integration easier and reusable. Microsoft documentation explains that a custom connector is a wrapper around a REST API that allows Logic Apps, Power Automate, Power Apps, or Copilot Studio to communicate with that REST or SOAP API. [2](https://community.dynamics.com/blogs/post/?postid=aa9407d5-06b5-40ea-87aa-52e239631f39)

    Dataverse also provides a Web API for developers and integrations. Microsoft documentation states that Dataverse Web API can be used to work with data, table definitions, and column definitions, and that it provides a development experience across many languages, platforms, and devices. [3](https://learn.microsoft.com/en-us/power-apps/developer/data-platform/webapi/overview)

    For real-world projects, API-based integration should be designed carefully with proper authentication, secure endpoints, clear request and response structure, error handling, logging, monitoring, and documentation. When done properly, API integration allows Power Platform solutions to connect with almost any modern business system.

    Microsoft Power Platform Mastery