In this scenario you maintain a list of GGNs in your IT system and constantly update this list with the master data and product certification data for each GGN with all their products out of the GLOBALG.A.P. Database.
Initially create a bookmarking list via bookmarkListInsert
Constantly add your known GGN numbers by adding bookmark items containing the producers GGN via bookmarkItemInsert
Ping the bookmarking list in a regular basis to receive any updates on the producers master data and product certification data via getBookmark
Please note that this scenario will deliver product information such as certification information of all producers which are bookmarked.