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Figure A: Notification of document availability	Figure B: OSF checking document availability
The following diagram describes the exchange flows for registration and retrieval of documents hosted in WIPO DAS by notification to OSF	The following diagram describes the exchange flows for registration and retrieval of documents hosted in WIPO DAS and the OSF checking on regular basis statuses of retrievals requests

Step	API Request	Notes
(1a) - OFF requests a pre-signed URL from WIPO DAS to upload a file identified by a file id	POST /das/v1/requests/files/url-uploads	Not required if OFF keeps the actual document file content in its own digital library
(1b) - OFF uploads the document file content using a pre-signed URL given in step (step 1a)	File upload via PUT
(1c) - OFF requests document registration to WIPO DAS by referring to the uploaded file content by the corresponding file id	POST /das/v1/requests/registrations

Step	API Request	Notes
(1c) - OFF requests document registration to WIPO DAS by specifying the new document attributes	PUT /das/v1/requests/registrations

Step	API Request	Notes
(1a) - OFF requests a pre-signed URL from WIPO DAS to upload a file identified by a file id	POST /das/v1/requests/files/url-uploads
(1b) - OFF uploads the corrected document file content using a pre-signed URL given in step (1a)
(1c) - OFF requests document registration to WIPO DAS by referring to the uploaded file content by the corresponding file id	PUT /das/v1/requests/registrations

Step	API Request	Notes
(2a) - OSF sends a document retrieval request to WIPO DAS and receives a request acknowledgement id	POST /das/v1/requests/retrievals
(2b) - WIPO DAS prepares the requested document for download and notifies the OSF of the document availability (i.e. Figure A) by referring to the request acknowledgement id returned in step (2a)	POST /das/v1/requests/notifications	Alternatively , OSF may use the check status (i.e. Figure B) to download the document content when it is reported as available by WIPO DAS (i.e. GET /das/v1/requests/retrievals)
(2c) - OSF retrieves file location URL from WIPO DAS to download the document file content	POST /das/v1/requests/url-downloads	Downloads can be repeated while the requested document is not deleted from WIPO DAS
(2d) - OSF downloads file from WIPO DAS
(2e) - Optionally OSF deletes the download files from the DAS transit zone	DELETE /das/v1/requests/files	If OSF does not delete the downloaded file, WIPO DAS will delete it after a pre-defined period (e.g. 1 week)

Fig. A	Fig. B