BatchRequest.gs

function main() {
  Logger.clear();
  var apiKey = '';
  var acctID = '';
  
  var token = retrieveTokenByApiKey(apiKey);
  
  url = 'https://api.wildapricot.org/v2/accounts/acctID/'
  
  var batchUrl = "https://api.wildapricot.org/batch";
  
  var batchData = 
  [{
      "Id": "get all available accounts",
      "Order": 0,
      "PathAndQuery": "/v2.1/accounts/",
      "Method": "GET",
   }
   ,
   {
    "Id": "create new contact",
    "Order": 1,
    "PathAndQuery": "/v2/accounts/236510/contacts",
    "Method": "POST",
    "Payload": "{\"FirstName\":\"Justin\"}",
    "ContentType": "application/json"
    }
   ];
  
  var jsonData = JSON.stringify(batchData);
  
  var response = executeBatchRequest(token,batchUrl,jsonData);
  
  Logger.log(JSON.stringify(response, null, "\t"));
}

function retrieveTokenByApiKey(apiKey)
{
  var authServiceUrl =  'https://oauth.wildapricot.org/auth/token';
  var scopeNames = 'auto';
  
  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 executeBatchRequest(token,batchUrl,jsonData)
{ 
    var requestParams = {
    method: 'POST',
    headers: { Authorization:'Bearer ' + token },
    accept:'application/json',
    contentType: 'application/json',
    payload: jsonData
  }
   
  var responseJson = UrlFetchApp.fetch(batchUrl, requestParams);
  var result = JSON.parse(responseJson);
  return result;
}