How to Develop an API Connection to Office365

Step 1: Register an App in Azure Active Directory

  1. Go to the Azure portal.
  2. Navigate to Azure Active Directory > App registrations > New registration.
  3. Enter a name for your app, select the supported account types, and then enter the redirect URI (if necessary).
  4. Click Register.

Step 2: Set API Permissions

  1. In your app’s overview page, click API permissions > Add a permission.
  2. Select Microsoft Graph > Delegated permissions.
  3. Add the necessary permissions (e.g., Calendars.ReadWrite, User.Read.All, OnlineMeetings.ReadWrite).
  4. Click Add permissions.

Step 3: Get Client ID and Secret

  1. From the app’s overview page, note down the Application (client) ID.
  2. Go to Certificates & secrets > New client secret.
  3. Add a description for the client secret, select its expiry, and then click Add.
  4. Note down the Value of the client secret.

Step 4: Develop the API Connection

  1. Use a suitable HTTP client library in your preferred programming language.
  2. Use the client ID and secret to obtain an access token from the Microsoft Identity platform token endpoint.
  3. Use this access token to make authenticated requests to the Microsoft Graph API.

Here’s a sample Python code snippet:

import requests
from msal import ConfidentialClientApplication

config = {
    "authority": "https://login.microsoftonline.com/YourTenantId",
    "client_id": "YourClientId",
    "client_secret": "YourClientSecret",
    "scope": ["https://graph.microsoft.com/.default"],
    "endpoint": "https://graph.microsoft.com/v1.0/me/events"
}

app = ConfidentialClientApplication(config["client_id"], authority=config["authority"], client_credential=config["client_secret"])
result = app.acquire_token_for_client(scopes=config["scope"])

if "access_token" in result:
    headers = {'Authorization': 'Bearer ' + result['access_token']}
    r = requests.get(config["endpoint"], headers=headers)
    print(r.json())
else:
    print(result.get("error"))
    print(result.get("error_description"))
    print(result.get("correlation_id"))

Step 5: Test the API Connection

  1. Use a tool like Postman to test the API connection.
  2. Use the access token obtained in the previous step to authenticate your requests.

Remember, this is a basic guide. Depending on your specific requirements, you might need to adjust these steps accordingly. Always refer to the official Microsoft documentation for the most accurate and up-to-date information. Happy coding! 🚀

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Updated on December 18, 2023