%%[
/* Get Subscribers Email Address */
  SET @email = RequestParameter("EmailAddress")

/* Get Access token using API creds */
    Var @body, @callstatus, @response
    Set @body = '{"clientId": "xxxxxx", "clientSecret": "yyyyyy"}'
    HTTPPost2("https://auth.exacttargetapis.com/v1/requestToken", "application/json", @body, True, @callstatus, @response)
]%%

<script runat="server">
  // Load response into SSJS for parsing
    Platform.Load("Core", "1")
  // get JSON from callstatus
    var callstatus = Variable.GetValue("@callstatus");
  // Parse the string to JSON
    callstatus = Platform.Function.ParseJSON(callstatus);
  // Get Access Token
    Variable.SetValue("@access_token",'BEARER ' + callstatus.accessToken);
</script>

%%[
/* Trigger the Journey via API event */
      Set @body = '{"ContactKey": @email, "EventDefinitionKey":"APIEvent-ad292469-4d77-17a9-e56d-b791b29b8b95", "EstablishContactKey": true, "Data": {"EmailAddress":@email}}'
      HTTPPost2("https://auth.exacttargetapis.com/interaction/v1/events", "application/json", @body, True, @callstatus, @response, 'Authorization', @access_token)
]%%