Hi, I was thinking about the cordova api. So ideally I would like to keep it close to the javascript api that we already have, but in cordova all things that are executed have a success and a failure callback so this doesn't really fit. cordova.exec(successCallback, errorCallback, "AeroGearPlugin", "generateOTP", [secret]); Nice would be if we could have something like this: var generator = new AeroGear.Totp(secret); var totp = generator.generateOTP(); but if we need a callback the closest to something like above will be something like this: var generator = new AeroGear.Totp(secret); generator.generateOTP(function(result) { console.log(result) }, function() { console.log('fail') }); maybe it's my not so great javascript knowledge but what do you guys think? Cheers, Erik Jan