Get the secret value for a secret item stored in the service.
The item is represented by its D-Bus object path. If you already have a [classItem] proxy object, use use [method
Item.get_secret] to more simply get its secret value.
This function returns immediately and completes asynchronously.
| this |
the secret service |
| item_path |
the D-Bus path to item to retrieve secret for |
| cancellable |
optional cancellation object |
| callback |
called when the operation completes |
| user_data |
data to pass to the callback |