The person submitting and collecting your visa or passport application on your behalf should come to the Embassy/ Consulate with your appointment slip to submit, and a collection slip to collect. They should also have their ID and an authorisation note from you stating their name in it.
A copy of the third party authorisation letter can be downloaded and printed when making your application online. However, if you have already submitted your application, we advise you to write your own third party authorisation letter for the person submitting/collecting on your behalf.