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Showing content from https://learn.microsoft.com/en-us/azure/api-management/api-management-howto-setup-delegation below:

How to delegate user registration and product subscription

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Delegation enables your website to own the user data and perform custom validation. With delegation, you can handle developer sign-in/sign-up (and related account management operations) and product subscription using your existing website, instead of the developer portal's built-in functionality.

To delegate developer sign-in and sign-up and developer account management options to your existing website, create a special delegation endpoint on your site. This special delegation acts as the entry-point for any sign-in/sign-up and related requests initiated from the API Management developer portal.

The final workflow will be:

1. Developer clicks on the sign-in or sign-up link or an account management link at the API Management developer portal.
2. Browser redirects to the delegation endpoint.
3. Delegation endpoint in return redirects user to or presents user with sign-in/sign-up or account management UI.
4. After the operation completes, user is redirected back to the API Management developer portal at the location they left.

1. In the Azure portal, navigate to your API Management instance.

2. In the left menu, under Developer portal, select Delegation.

3. Click the checkbox to enable Delegate sign-in & sign-up.

4. Decide your special delegation endpoint's URL and enter it in the Delegation endpoint URL field.

5. Within the Delegation Validation Key field, either:

   • Enter a secret used to compute a signature provided for verification that the request originates from API Management.
   • Click the Generate button for API Management to generate a random key for you.

6. Click Save.

Recommended steps for creating a new delegation endpoint to implement on your site:

1. Receive a request in the following form, depending on the operation:

   http://www.yourwebsite.com/apimdelegation?operation={operation}&returnUrl={URL of source page}&salt={string}&sig={string}

   -Or-

   http://www.yourwebsite.com/apimdelegation?operation={operation}&userId={user ID of account}&salt={string}&sig={string}

   Query parameters:

   Parameter Description operation Identifies the delegation request type. Available operations: SignIn, SignUp, ChangePassword, ChangeProfile, CloseAccount, SignOut. returnUrl On SignIn or SignUp, the URL of where the user clicked on a sign-in or sign-up link. userId On ChangePassword, ChangeProfile, CloseAccount, and SignOut, the user ID of the account you wish to manage. salt A special salt string used for computing a security hash. sig A computed security hash used for comparison to your own computed hash.

2. Verify the request comes from Azure API Management (optional, but highly recommended for security).

   • Compute an HMAC-SHA512 hash of a string based on the returnUrl (or UserId) and salt query parameters. For examples, check our example code.

     For SignIn and SignUp:

     HMAC(salt + '\n' + returnUrl)
     

     For ChangePassword, ChangeProfile, CloseAccount, and SignOut:

     HMAC(salt + '\n' + userId)
     

   • Compare the above-computed hash to the value of the sig query parameter. If the two hashes match, move on to the next step. Otherwise, deny the request.

3. Verify you receive a request for a sign-in/sign-up or account management operation.

4. Present the user with sign-in/sign-up or account management UI.

5. After completing the operation on your side, manage the user in API Management. For example, if the user signs up, create a corresponding account for them in API Management.

   • Create a user with the API Management REST API.
   • Set the user ID to either the same value in your user store or a new, easily tracked ID.

6. After sign-in or sign-up, when the user is successfully authenticated:

   • Request a shared access token via the API Management REST API.

   • Append a returnUrl query parameter to the SSO URL you received from the API call above. For example:

     https://contoso.developer.azure-api.net/signin-sso?token=<URL-encoded token>&returnUrl=%2Freturn%2Furl

   • Redirect the user to the above-produced URL.

Delegating product subscriptions works similarly to delegating user sign-in/sign-up. The final workflow would be as follows:

1. Developer selects a product in the API Management developer portal and clicks on the Subscribe button.
2. Browser redirects to the delegation endpoint.
3. Delegation endpoint performs required product subscription steps, which you design. They may include:
   • Redirecting to another page to request billing information.
   • Asking additional questions.
   • Storing the information and not requiring any user action.

On the Delegation page, click Delegate product subscription.

Recommended steps for creating a new delegation endpoint to implement on your site:

1. Receive a request in the following form, depending on the operation.

   http://www.yourwebsite.com/apimdelegation?operation={operation}&productId={product to subscribe to}&userId={user making request}&salt={string}&sig={string}

   -Or-

   http://www.yourwebsite.com/apimdelegation?operation={operation}&subscriptionId={subscription to manage}&salt={string}&sig={string}

   Query parameters:

   Parameter Description operation Identifies the delegation request type. Valid product subscription requests options are:
   • Subscribe: a request to subscribe the user to a given product with provided ID (see below).
   • Unsubscribe: a request to unsubscribe a user from a product
   productId On Subscribe, the product ID that the user requested subscription. userId On Subscribe, the requesting user's ID. subscriptionId On Unsubscribe, the product subscription ID. salt A special salt string used for computing a security hash. sig A computed security hash used for comparison to your own computed hash.

2. Verify that the request is coming from Azure API Management (optional, but highly recommended for security)

   • Compute an HMAC-SHA512 of a string based on the productId and userId (or subscriptionId) and salt query parameters:

     For Subscribe:

     HMAC(salt + '\n' + productId + '\n' + userId)
     

     For Unsubscribe:

     HMAC(salt + '\n' + subscriptionId)
     

   • Compare the above-computed hash to the value of the sig query parameter. If the two hashes match, move on to the next step. Otherwise, deny the request.

3. Process the product subscription based on the operation type requested in operation (for example: billing, further questions, etc.).

4. After completing the operation on your side, manage the subscription in API Management. For example, subscribe the user to the API Management product by calling the REST API for subscriptions.

These code samples show how to generate the hash of the returnUrl query parameter when delegating user sign-in or sign-up. The returnUrl is the URL of the page where the user clicked on the sign-in or sign-up link.

• Take the delegation validation key, which is set in the Delegation screen of the Azure portal.
• Create an HMAC, which validates the signature, proving the validity of the passed returnUrl.

With slight modification, you can use the same code to calculate other hashes, such as with productId and userId when delegating product subscription.

using System.Security.Cryptography;

string key = "delegation validation key";
string returnUrl = "returnUrl query parameter";
string salt = "salt query parameter";
string signature;
using (var encoder = new HMACSHA512(Convert.FromBase64String(key)))
{
    signature = Convert.ToBase64String(encoder.ComputeHash(Encoding.UTF8.GetBytes(salt + "\n" + returnUrl)));
    // change to (salt + "\n" + productId + "\n" + userId) when delegating product subscription
    // compare signature to sig query parameter
}

var crypto = require('crypto');

var key = 'delegation validation key'; 
var returnUrl = 'returnUrl query parameter';
var salt = 'salt query parameter';

var hmac = crypto.createHmac('sha512', new Buffer(key, 'base64'));
var digest = hmac.update(salt + '\n' + returnUrl).digest();
// change to (salt + "\n" + productId + "\n" + userId) when delegating product subscription
// compare signature to sig query parameter

var signature = digest.toString('base64');

• Learn more about the developer portal.
• Authenticate using Microsoft Entra ID or with Microsoft Entra External ID.
• More developer portal questions? Find answers in our FAQ.

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