createEvent.gs

function main() {
  Logger.clear();
  var apiKey = "your apikey here";
  var urls = urlBuilder();
  var token = retrieveTokenByApiKey(urls.getAuthServiceUrl(), apiKey);
  var accountId = getDataFromApi(urls.getAccountsListUrl(), token)[0].Id;
  
//  createdContact = createNewContact(urls,token,accountId);
//  Logger.log(createdContact);
  
  createdEvent = createNewEvent(urls,token,accountId);
  Logger.log(createdEvent);

}

// This works

function createNewContact(urls,token,accountId)
{
  var newContact = 
  {
  "FirstName": "First Test",
  "LastName": "Last Test"
  };
  
  var createdContact = executeApiRequest(urls.getContactsListUrl(accountId),token,'POST', newContact);
  Logger.log(createdContact);
}

// This event data below works in the API browser, just not here.
// This returns a 403 response code

function createNewEvent(urls,token,accountId)
{  
  var newEvent = 
  {
  "StartDate": "2017-07-05T10:00:00+03:00",
  "EndDate": "2017-07-11T18:00:00+03:00",
  "Location": "Boston Hilton",
  "RegistrationEnabled": false,
  "RegistrationsLimit": 100,
  "StartTimeSpecified": false,
  "EndTimeSpecified": false,
  "Name": "Annual General Meeting",
  "Tags": [
    "meeting",
    "agm"
  ],
  "Details": {
    "DescriptionHtml": "Join us at our annual general meeting",
    "PaymentInstructions": "Please pay online",
    "AccessControl": {
      "AccessLevel": "Public"
    },
    "GuestRegistrationSettings": {
      "CreateContactMode": "CreateContactForAllGuests"
    },
    "Organizer": null,
    "PaymentMethod": "OnlineOnly",
    "RegistrationConfirmationExtraInfo": "additional info for confirmation email",
    "RegistrationMessage": "additional info for registration wizard",
    "SendEmailCopy": true,
    "WaitListBehaviour": "RequestNameAndEmail"
  }
};  
  var createdEvent = executeApiRequest(urls.getEventsListUrl(accountId),token,'POST', newEvent);
  Logger.log(createdEvent);
}
    


function getDataFromApi(url, token)
{
  return executeApiRequest(url, token, 'GET');
}



function executeApiRequest(url, token, method, data)
{
  if (typeof method === 'undefined') { method = 'GET'; }
  
   var requestParams = {
    method:method,
    headers: { Authorization:'Bearer ' + token },
    accept:'application/json'
  }
   
  if( data )
  {
    requestParams.payload = JSON.stringify(data);
    requestParams.contentType = 'application/json';    
  }
   
  var responseJson = UrlFetchApp.fetch(url, requestParams);
  var result = JSON.parse(responseJson);
  return result;
}



function retrieveTokenByApiKey(authServiceUrl, apiKey)
{
  var scopeNames = "contacts finances events event_registrations account membership_levels";
  
  var authRequestParams = {
    method:'POST',
    headers:{
      Authorization:'Basic ' + Utilities.base64Encode('APIKEY' + ':' + apiKey)
    },
    contentType: 'application/x-www-form-urlencoded',
    payload: Utilities.formatString('grant_type=%s&scope=%s', 'client_credentials', scopeNames)
  };

  var tokenJson = UrlFetchApp.fetch(authServiceUrl, authRequestParams);
  var tokenData = JSON.parse(tokenJson);
  return tokenData.access_token;
}


function urlBuilder()
{
  var apiUrl = 'https://api.wildapricot.org';
  return {
    getAuthServiceUrl: function()
    {
      return 'https://oauth.wildapricot.org/auth/token';
    },
    getAccountsListUrl: function()
    {
      return apiUrl+'/v2/accounts';
    },
    getContactFieldsUrl: function(accountId)
    {
      return apiUrl+'/v2/accounts/' + accountId + '/contactfields';
    },
    getContactsListUrl: function(accountId)
    {
      return apiUrl+'/v2/accounts/' + accountId + '/contacts';
    },
    getEventsListUrl: function(accountId)
    {
      return apiUrl+'/v2/accounts/' + accountId + '/events';
    }
  };
}