title: Laravel 5.5 the payload is invalid response in postman when trying to decrypt string
body: <p>Im trying to decrypt string that will be send by the other user using other platform. we are using the same encryption type (AES-256-CBC). when i pass the encrypted string in my body and call the api i get <strong>The payload is invalid</strong> message. please someone explain me the issue and also help me find out what the <strong>key</strong> is in this encryption method and where is the key in my project..
  [Currently im using the app key for key], when i encrypt a string in my project and pass it to the body, i get the required output but not when i use the encrypted value from other user. 
  <a href="https://i.stack.imgur.com/bPUCi.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/bPUCi.png" alt="using postman to send the encrypted value"></a></p>
  
  <p><a href="https://i.stack.imgur.com/fn09C.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/fn09C.png" alt="the controller called by the api"></a></p>