A method of handling a document stored in a cloud storage system, in which a user is identified by first user credentials, for processing by an authenticated printing system for which said user is identified by second user credentials, comprising the steps of i. obtaining said document from said cloud storage, said first user credentials being associated with said document, ii. obtaining said second user credentials based on said first user credentials, iii. obtaining a print job corresponding to said document, said print job comprising print job metadata comprising said second user credentials, and iv. forwarding at least said print job metadata, comprising said second user credentials, to said authenticated printing system for said processing, characterized in that obtaining said second user credentials further comprises: querying a user credentials mapping database using the first user credentials, and if the first user credentials are found in the user credentials mapping database and are mapped to second user credentials in the user credentials mapping database, retrieving the second user credentials from the user credentials mapping database, and if said first user credentials are not found in the user credentials mapping database, or if no second user credentials are mapped to the first user credentials in the user credentials mapping database, obtaining the second user credentials from the user using the first user credentials, where said steps are performed by a processing server connectable to said cloud storage system and said authenticated printing system. i. obtaining said document from said cloud storage, said first user credentials being associated with said document, ii. obtaining said second user credentials based on said first user credentials, iii. obtaining a print job corresponding to said document, said print job comprising print job metadata comprising said second user credentials, and iv. forwarding at least said print job metadata, comprising said second user credentials, to said authenticated printing system for said processing, characterized in that obtaining said second user credentials further comprises: querying a user credentials mapping database using the first user credentials, and if the first user credentials are found in the user credentials mapping database and are mapped to second user credentials in the user credentials mapping database, retrieving the second user credentials from the user credentials mapping database, and if said first user credentials are not found in the user credentials mapping database, or if no second user credentials are mapped to the first user credentials in the user credentials mapping database, obtaining the second user credentials from the user using the first user credentials, where said steps are performed by a processing server connectable to said cloud storage system and said authenticated printing system. querying a user credentials mapping database using the first user credentials, and if the first user credentials are found in the user credentials mapping database and are mapped to second user credentials in the user credentials mapping database, retrieving the second user credentials from the user credentials mapping database, and if said first user credentials are not found in the user credentials mapping database, or if no second user credentials are mapped to the first user credentials in the user credentials mapping database, obtaining the second user credentials from the user using the first user credentials, where said steps are performed by a processing server connectable to said cloud storage system and said authenticated printing system.