chapter56.amp

%%[
    /* Variable Declarations */
    /* Define your Client ID and Client Secret provided by Salesforce Marketing Cloud */
    SET @clientId = "YOUR_CLIENT_ID" /* Replace with your actual Client ID */
    SET @clientSecret = "YOUR_CLIENT_SECRET" /* Replace with your actual Client Secret */

    /* Define the Authentication Endpoint for your Marketing Cloud account */
    SET @authEndpoint = "https://YOUR_SUBDOMAIN.auth.marketingcloudapis.com/v2/token" /* Replace 'YOUR_SUBDOMAIN' with your actual subdomain */

    /* Define the payload for the authentication request in JSON format */
    SET @payload = Concat(
                        '{
                            "client_id": "',@clientId,'", 
                            "client_secret": "',@clientSecret,'", 
                            "grant_type": "client_credentials"
                        }'
                        )

    /* Send an HTTP POST request to the Authentication Endpoint with the payload */
    HTTPPost2(@authEndpoint, "application/json", @payload, true, @response, @callstatus)

    /* Parse the JSON response into a rowset for easier handling */
    SET @rowset = BuildRowsetFromJson(@response, '$.*', 1) 

    /* Extract the first row from the rowset to get individual fields */
    SET @row = Row(@rowset, 1) 

    /* Retrieve the 'Value' field from the first row, which is the Access Token */
    SET @accessToken = FIELD(@row, 'Value')

    /* Extract the second row to get the token type */
    SET @row = Row(@rowset, 2) 
    SET @tokentype = FIELD(@row, 'Value')

    /* Combine the token type and access token to create the Authorization header */
    SET @authorization = Concat(@tokentype, ' ', @accessToken)
]%%

/* Output the Authorization header for verification */
%%=v(@authorization)=%%