get_progress_async
Description:
[ Version ( since = "0.5.2" ) ]
public async Progress get_progress_async (string transaction_id, Cancellable? cancellable) throws Error
  public async Progress get_progress_async (string transaction_id, Cancellable? cancellable) throws Error
Find the current state of a transaction.
Parameters:
| this | a valid Client instance | 
| transaction_id | a transaction ID such as "/21_ebcbdaae_data" | 
| cancellable | a Cancellable or  | 
| callback_ready | the function to run on completion | 
| user_data | the data to pass to  |