SCRIPT CODE FOR GOOGLE SHEETS 

var sheetName = 'Sheet1'

var scriptProp = PropertiesService.getScriptProperties()

function intialSetup () {

 var activeSpreadsheet = SpreadsheetApp.getActiveSpreadsheet()

 scriptProp.setProperty('key', activeSpreadsheet.getId())

}

function doPost (e) {

 var lock = LockService.getScriptLock()

 lock.tryLock(10000)

 try {

var doc = SpreadsheetApp.openById(scriptProp.getProperty('key'))

var sheet = doc.getSheetByName(sheetName)

var headers = sheet.getRange(1, 1, 1, sheet.getLastColumn()).getValues()[0]

var nextRow = sheet.getLastRow() + 1

var newRow = headers.map(function(header) {

 return header === 'timestamp' ? new Date() : e.parameter[header]

})

sheet.getRange(nextRow, 1, 1, newRow.length).setValues([newRow])

return ContentService

 .createTextOutput(JSON.stringify({ 'result': 'success', 'row': nextRow }))

 .setMimeType(ContentService.MimeType.JSON)

 }

 catch (e) {

return ContentService

 .createTextOutput(JSON.stringify({ 'result': 'error', 'error': e }))

 .setMimeType(ContentService.MimeType.JSON)

 }

 finally {

lock.releaseLock()

 }

}