I think I might have a few other bits to add, let me have a poke around and compile what I know.

I might also just alert some of the other developers (mrkgnao and woolymethodman) as they may know more or be able to benefit from this too.

Edit: I've had a look, but the ones I have that aren't listed aren't necessarily the same as what you've already got.
They work on www.gog.com and embed.gog.com but aren't on separate subdomains (users.gog or chat.gog say) like the stuff you've compiled.

Here's two anyway, if they're of any use I'll tidy them up and write some details for them.

First one is for users public wishlists:
https://embed.gog.com/public_wishlist/829572545933/search?hiddenFlag=0&mediaType=0&page=1&sortBy=date_added&totalPages=4

And second is for reviews on game pages:
https://embed.gog.com/reviews/product/1207658889.json?page=1

I'll keep poking about for others.

Edit 2: There's also
https://embed.gog.com/friends/search
Which the friends page uses to find users, you need to send a single correct username in the form {"query":"adaliabooks"} with it and it returns basically the same as the other user calls do.

Something like GOG Galaxy would be awesome, but a console client is probably more realistic right now.

Gogrepo was a great way to get started, but they handle a lot of API stuff and I'd like to put that into a separate library. Some code will definitely be reused.

The stuff on separate subdomains is only a small part. I take everything that could be considered an API method, because it may be useful some day.

I found the public wishlist and friends search yesterday in accounts.js as well. Wishlist is already done, but you can write about the friends search. Reviews have its own dedicated page, you probably missed that. I should probably add all the URLs as soon as they are discovered, so someone else can work with them. Thanks for your help!

I'll report anything else I find then.

I did check to see if you had any of it already so not to double up but I must have missed the Reviews bit.
I'll try do a little documentation of the friends search when I get in later.
The various Javascript files the site uses are a good place to find things like that as well, though it looks like you have most of them already.

I just added a ton of new URLs for settings, tags, order history and wallet. Hopefully that covers the most important parts of the site. Forum and support is still missing because they seem to use some legacy API and the chat is just really complicated. Let me know if I forgot about something!

One question: Can this API be used to download the Linux versions of games (since GOG Galaxy doesn't have a Linux version)?

Also, can you download versions that are normally only available through Galaxy (like rollback versions)? In particular, can you get rollback on Linux this way?

The API can be used to download the full Linux installers, but not for incremental updates, which are also required for rollback versions. There's an entry for content_system_compatibility.linux in the product data, but I've never seen it set to true. It also highly unlikely that we could get permission to distribute our own rollback data.

Example product response: https://api.gog.com/products/1207658930

Hi Yepoleb. I see I was too slow and you added it yourself, but I'll make sure to send a pull request if I discover anything else that you don't have yet.

Adaliabooks has drawn my attention to this project. Very impressive.

I don't have much to add from MaGog, but I will point out that your Game ID List currently seems to list only catalogue IDs, not library IDs, and the two are not the same for quite a few GOG games, either because they are unbundled (multiple library boxes for one catalogue item, e.g. Cognition) or because GOG just decided to have different IDs for a more-or-less unclear reason (e.g. Quake).

For what it's worth, I'll post below MaGog's internal list of library IDs, where differing from the catalogue ID. It'll be in two parts due to GOG's character limit.

Format is:
"LIBRARY_ID" => [CATALOGUE_ID, "DESCRIPTIVE_NAME"

Note: If a game has multiple editions (e.g. Tyranny), the library ID is associated with the catalogue ID of the base (non-premium) edition (e.g. Commander Edition).

Good luck.

P.S. In case you don't know who MaGog is, you can visit her here: http://www.an-ovel.com/pages/magog.php

Part 1:
"1207659643" => [1207659633, "cognition episode 1 the hangman"
"1207659653" => [1207659633, "cognition episode 2 the wise monkey"
"1207659663" => [1207659633, "cognition episode 3 the oracle"
"1207659673" => [1207659633, "cognition episode 4 the cain killer"
"1207664273" => [1207659250, "dracula 4 shadow of the dragon"
"1207664283" => [1207659250, "dracula 5 the blood legacy"
"1207666383" => [1207666263, "star wars xwing 1993"
"1207666393" => [1207666263, "star wars xwing 1998"
"1207667213" => [1207666263, "star wars xwing collectors cd 1994"
"1207666403" => [1207666273, "star wars tie fighter 1994"
"1207666413" => [1207666273, "star wars tie fighter 1998"
"1207667223" => [1207666273, "star wars tie fighter collectors cd 1995"
"1207667043" => [1423059062, "mortal kombat 1"
"1207667053" => [1423059062, "mortal kombat 2"
"1207667063" => [1423059062, "mortal kombat 3"
"1422440106" => [1422357672, "ys i"
"1422440145" => [1422357672, "ys ii"
"1422357636" => [1422281930, "supreme league of patriots episode 1"
"1422357706" => [1422281930, "supreme league of patriots episode 2"
"1422357761" => [1422281930, "supreme league of patriots episode 3"
"1207663733" => [1207658988, "alien breed"
"1207663753" => [1207658988, "alien breed tower assault game"
"1207663003" => [1207660243, "american mcgees grimm season 1"
"1207663013" => [1207660243, "american mcgees grimm season 2"
"1207663023" => [1207660243, "american mcgees grimm season 3"
"1207662763" => [1207659229, "wizardry 6"
"1207662783" => [1207659229, "wizardry 7 gold"
"1207662663" => [1207660153, "wing commander prophecy"
"1207662673" => [1207660153, "wing commander secret ops"
"1207662643" => [1207658960, "wing commander"
"1207662653" => [1207658960, "wing commander ii"
"1207662633" => [1207658984, "ultima vii serpent isle"
"1207662623" => [1207658984, "ultima vii the black gate the forge of virtue"
"1207662433" => [1207658965, "ultima iv"
"1207662453" => [1207658965, "ultima vi"
"1207662443" => [1207658965, "ultima v"
"1207662463" => [1207658937, "ultima underworld i"
"1207662473" => [1207658937, "ultima underworld ii"
"1207662613" => [1207658961, "ultima iii"
"1207662603" => [1207658961, "ultima ii"
"1207662593" => [1207658961, "ultima i"
"1207661843" => [1207659214, "two worlds ii castle defense"
"1207661833" => [1207659214, "two worlds ii velvet edition"
"1207663953" => [1207658817, "tropico"
"1207663963" => [1207658817, "tropico 2"
"1207663513" => [1207659077, "tomb raider the last revelation"
"1207663523" => [1207659077, "tomb raider chronicles"
"1207661533" => [1207658903, "beyond zork the coconut of quendor"
"1207661543" => [1207658903, "planetfall"
"1207661493" => [1207658903, "zork the great underground empire"
"1207661503" => [1207658903, "zork ii the wizard of frobozz"
"1207661513" => [1207658903, "zork iii the dungeon master"
"1207661523" => [1207658903, "zork zero the revenge of megaboz"
"1207663463" => [1207659052, "tomb raider 1"
"1207663483" => [1207659052, "tomb raider 2"
"1207663493" => [1207659052, "tomb raider 3"
"1207662983" => [1207659743, "ben there dan that"
"1207662993" => [1207659743, "time gentlemen please"
"1207660933" => [1207658766, "tex murphy 1 mean streets"
"1207660943" => [1207658766, "tex murphy 2 martian memorandum"
"1207662393" => [1207658983, "starflight 1"
"1207662403" => [1207658983, "starflight 2"
"1207661663" => [1207658925, "star control"
"1207661673" => [1207658925, "star control 2"
"1207661443" => [1207658833, "space quest 4 roger wilco and the time rippers"
"1207661453" => [1207658833, "space quest 5 the next mutation"
"1207661463" => [1207658833, "space quest 6 roger wilco in the spinal frontier"
"1207661413" => [1207658875, "space quest 1 the sarien encounter"
"1207661423" => [1207658875, "space quest 2 vohauls revenge"
"1207661433" => [1207658875, "space quest 3 the pirates of pestulon"
"1207661883" => [1207660513, "silent service"
"1207661893" => [1207660513, "silent service 2"
"1207662383" => [1207658686, "deus"
"1207662373" => [1207658686, "robinsons requiem"
"1207661973" => [1207658796, "realms of arkania blade of destiny"
"1207661983" => [1207658796, "realms of arkania star trail"
"1207661313" => [1207659040, "quest for glory includes vga remake"
"1207661323" => [1207659040, "quest for glory 2"
"1207661383" => [1207659040, "quest for glory 3"
"1207661393" => [1207659040, "quest for glory 4"
"1207661403" => [1207659040, "quest for glory 5"
"1207661473" => [1207658909, "police quest swat"
"1207661483" => [1207658909, "police quest swat 2"
"1207661263" => [1207658902, "police quest in pursuit of the death angel"
"1207661283" => [1207658902, "police quest 2 vengeance"
"1207661293" => [1207658902, "police quest 3 the kindred"
"1207661303" => [1207658902, "police quest 4 open season"
"1207664093" => [1207658910, "pinball dreams deluxe"
"1207664103" => [1207658910, "pinball fantasies deluxe"
"1207664113" => [1207658910, "pinball illusions"
"1207663903" => [1207658765, "neighbours from hell 1"
"1207663923" => [1207658765, "neighbours from hell 2"
"1207661243" => [1207658788, "might and magic swords of xeen"
"1207661203" => [1207658788, "might and magic 1 book i"
"1207661213" => [1207658788, "might and magic 2 gates to another world"
"1207661223" => [1207658788, "might and magic 3 isles of terra"
"1207661233" => [1207658788, "might and magic 45 world of xeen"
"1207661253" => [1207658788, "might and magic 6 the mandate of heaven"
"1207661603" => [1207658758, "megarace"
"1207661613" => [1207658758, "megarace 2"
"1207661633" => [1207658854, "master of orion 2"
"1207661623" => [1207658854, "master of orion classic"
"1207662043" => [1207659158, "leisure suit larry 1 vga in the land of the lounge lizards"
"1207662033" => [1207659158, "leisure suit larry 1 in the land of the lounge lizards"
"1207662053" => [1207659158, "leisure suit larry 2 looking for love in several wrong places"
"1207662063" => [1207659158, "leisure suit larry 3 passionate patti in pursuit of the pulsating pectorals"
"1207662073" => [1207659158, "leisure suit larry 5 passionate patti does a little undercover work"
"1207662093" => [1207659158, "leisure suit larry 6 vga shape up or slip out"
"1207662083" => [1207659158, "leisure suit larry 6 shape up or slip out"
"1207662103" => [1207659158, "softporn adventure"
"1207662563" => [1207658980, "lands of lore guardians of destiny"
"1207662513" => [1207658980, "lands of lore the throne of chaos"
"1207661043" => [1207658881, "kings quest 7 the princeless bride"
"1207661053" => [1207658881, "kings quest 8 mask of eternity"
"1207662333" => [1207658685, "crystals of arborea"
"1207662343" => [1207658685, "ishar legend of the fortress"
"1207662353" => [1207658685, "ishar 2 messengers of doom"
"1207662363" => [1207658685, "ishar 3 the seven gates of infinity"
"1207663943" => [1207658799, "return of the incredible machine contraptions"
"1207664023" => [1207658799, "even more incredible machine the"
"1207664043" => [1207658799, "incredible machine even more contraptions the"
"1207664053" => [1207658799, "incredible machine 3 the"
"1207663863" => [1207658790, "incoming"
"1207663873" => [1207658790, "incoming forces"
"1207661143" => [1207659022, "heroes of might and magic v hammers of fate"
"1207661193" => [1207659022, "heroes of might and magic v tribes of the east"
"1207661743" => [1207658942, "heroes chronicles chapter 1 warlords of the wasteland"
"1207661753" => [1207658942, "heroes chronicles chapter 2 conquest of the underworld"
"1207661763" => [1207658942, "heroes chronicles chapter 3 masters of the elements"
"1207661773" => [1207658942, "heroes chronicles chapter 4 clash of the dragons"
"1207661783" => [1207658942, "heroes chronicles chapter 5 the world tree"
"1207661793" => [1207658942, "heroes chronicles chapter 6 the fiery moon"
"1207661803" => [1207658942, "heroes chronicles chapter 7 revolt of the beastmasters"
"1207661813" => [1207658942, "heroes chronicles chapter 8 the sword of frost"
"1207661583" => [1207658759, "haegemonia legions of iron"
"1207661593" => [1207658759, "haegemonia the solon heritage"
"1207662273" => [1207658846, "gobliiins"
"1207662293" => [1207658846, "gobliins 2 the prince buffoon"
"1207662313" => [1207658846, "goblins quest 3"
"1207662923" => [1207659067, "geneforge 1"
"1207662933" => [1207659067, "geneforge 2"
"1207662953" => [1207659067, "geneforge 3"
"1207662963" => [1207659067, "geneforge 4"
"1207662973" => [1207659067, "geneforge 5"
"1207663103" => [1207658672, "earthworm jim"
"1207663113" => [1207658672, "earthworm jim 2"
"1207664963" => [1207659149, "duke nukem"
"1207664973" => [1207659149, "duke nukem 2"
"1207662013" => [1207660443, "drod 2 journey to rooted hold"
"1207662023" => [1207660443, "drod 3 the city beneath"
"1207662003" => [1207660443, "drod king dugans dungeon"
"1207661553" => [1207659251, "dracula the resurrection"
"1207661563" => [1207659251, "dracula 2 the last sanctuary"
"1207661573" => [1207659251, "dracula 3 the path of the dragon"
"1207663703" => [1207658697, "disciples 2 dark prophecy and galleans return"
"1207663713" => [1207658697, "disciples 2 rise of the elves"
"1207663083" => [1207658656, "descent"
"1207663093" => [1207658656, "descent 2"

Part 2:
"1207663853" => [1207659199, "cultures 8th wonder of the world"
"1207663833" => [1207659199, "cultures northland"
"1207663793" => [1207659152, "cultures"
"1207663813" => [1207659152, "cultures 2"
"1207662233" => [1207658813, "creatures"
"1207662243" => [1207658813, "creatures 2"
"1207662823" => [1207659005, "cossacks art of war"
"1207662833" => [1207659005, "cossacks back to war"
"1207662843" => [1207659005, "cossacks european wars"
"1207662193" => [1207658800, "commandos behind enemy lines"
"1207662203" => [1207658800, "commandos beyond the call of duty"
"1207662213" => [1207658803, "commandos 2 men of courage"
"1207662223" => [1207658803, "commandos 3 destination berlin"
"1207663063" => [1207658678, "castles"
"1207663073" => [1207658678, "castles 2"
"1207661913" => [1207660453, "bloodnet cd version"
"1207661923" => [1207660453, "bloodnet fdd version"
"1207664013" => [1207659119, "blitzkrieg 2"
"1207664063" => [1207659119, "blitzkrieg 2 fall of the reich"
"1207664033" => [1207659119, "blitzkrieg 2 liberation"
"1207662903" => [1207659050, "blackwell convergence"
"1207662913" => [1207659050, "blackwell deception"
"1207662883" => [1207659050, "blackwell legacy the"
"1207662893" => [1207659050, "blackwell unbound"
"1207660953" => [1207658850, "betrayal at krondor"
"1207660983" => [1207658850, "betrayal in antara"
"1207660993" => [1207658917, "battle isle"
"1207661073" => [1207658917, "battle isle 2"
"1207661103" => [1207658917, "battle isle 3"
"1207661063" => [1207658917, "historyline 19141918"
"1207661123" => [1207658917, "incubation"
"1207663033" => [1207658676, "battle chess"
"1207663053" => [1207658676, "battle chess 4000"
"1207663043" => [1207658676, "battle chess ii chinese chess"
"1207663333" => [1207659156, "avernum"
"1207663353" => [1207659156, "avernum 2"
"1207663373" => [1207659156, "avernum 3"
"1207663403" => [1207659156, "avernum 4"
"1207663423" => [1207659156, "avernum 5"
"1207663443" => [1207659156, "avernum 6"
"1207663383" => [1207659156, "blades of avernum"
"1427704538" => [1427704829, "act of war direct action"
"1427704705" => [1427704829, "act of war high treason"
"1207660323" => [1207660313, "broken sword 5 the serpents curse"
"1429023691" => [1428932392, "hearts of iron ii"
"1429024026" => [1428932392, "hearts of iron ii doomsday"
"1207663203" => [1207659099, "wallace and gromits episode 1 fright of the bumblebees"
"1207663223" => [1207659099, "wallace and gromits episode 2 the last resort"
"1207663243" => [1207659099, "wallace and gromits episode 3 muzzled"
"1207663253" => [1207659099, "wallace and gromits episode 4 the bogey man"
"1207663973" => [1207658801, "red baron 1"
"1207663983" => [1207658801, "red baron 3d"
"1207661643" => [1207659060, "pirates"
"1207661653" => [1207659060, "pirates gold"
"1207662743" => [1207659255, "penumbra black plague"
"1207662733" => [1207659255, "penumbra overture"
"1207662753" => [1207659255, "penumbra requiem"
"1207663913" => [1207658802, "patrician"
"1207663933" => [1207658802, "patrician ii quest for power"
"1207663773" => [10, "max"
"1207663783" => [10, "max 2"
"1207663213" => [1207658780, "lords of the realm"
"1207663233" => [1207658780, "lords of the realm cd version"
"1207663263" => [1207658780, "lords of the realm ii"
"1207661083" => [1207658878, "kings quest"
"1207661113" => [1207658878, "kings quest 2 romancing the throne"
"1207661133" => [1207658878, "kings quest 3 to heir is human"
"1207661153" => [1207658839, "kings quest 4 the perils of rosella"
"1207661163" => [1207658839, "kings quest 5 absence makes the heart go yonder"
"1207661173" => [1207658839, "kings quest 6 heir today gone tomorrow"
"1207661003" => [1207658836, "interstate 76"
"1207661023" => [1207658836, "interstate 76 nitro pack"
"1207662853" => [1207659216, "great battles of alexander the"
"1207662873" => [1207659216, "great battles of caesar the"
"1207662863" => [1207659216, "great battles of hannibal the"
"1207661853" => [1207658739, "earth 2150 escape from the blue planet"
"1207661863" => [1207658739, "earth 2150 lost souls"
"1207661873" => [1207658739, "earth 2150 the moon project"
"1207663993" => [1207659071, "blitzkrieg"
"1207664003" => [1207659071, "blitzkrieg burning horizon rolling thunder iron division"
"1207662803" => [1207659004, "american conquest"
"1207662813" => [1207659004, "american conquest fight back"
"1422286819" => [1421405068, "star wars jedi knight dark forces ii"
"1422285784" => [1421405068, "star wars jedi knight dark forces ii mysteries of the sith"
"1429104954" => [1429011813, "star wars rebel assault 1"
"1429105182" => [1429011813, "star wars rebel assault 2"
"1430392753" => [1207659573, "shadow warrior 2013"
"1429878383" => [1207659573, "shadow warrior 2013 directx 11 version"
"1207660923" => [1207658923, "alone in the dark 1"
"1207660963" => [1207658923, "alone in the dark 2"
"1207660973" => [1207658923, "alone in the dark 3"
"1207666553" => [1207666663, "randals monday"
"1207665783" => [1207665713, "wasteland 2"
"1444386007" => [1207665713, "wasteland 2 directors cut"
"1430912792" => [1430913339, "prehistorik"
"1430913246" => [1430913339, "prehistorik 2"
"1435735429" => [1434542135, "pajama sam no need to hide when its dark outside"
"1434535097" => [1434542135, "pajama sam 2 thunder and lightning arent so frightening"
"1434535284" => [1434542135, "pajama sams lost found"
"1434536205" => [1435136567, "pajama sam 3 you are what you eat from your head to your feet"
"1434538201" => [1435136567, "pajama sam 4 life is rough when you lose your stuff"
"1434538373" => [1435136567, "pajama sams sock works"
"1207664643" => [1207664663, "the witcher 3 wild hunt"
"1432575012" => [1436868249, "eye of the beholder"
"1432576039" => [1436868249, "eye of the beholder ii the legend of darkmoon"
"1432576327" => [1436868249, "eye of the beholder iii assault on myth drannor"
"1432642138" => [1436871302, "curse of the azure bonds"
"1432650732" => [1436871302, "forgotten realms unlimited adventures"
"1432649588" => [1436871302, "gateway to the savage frontier"
"1432640506" => [1436871302, "hillsfar"
"1432640961" => [1436871302, "pool of radiance"
"1432643408" => [1436871302, "pools of darkness"
"1432641528" => [1436871302, "secret of the silver blades"
"1432641771" => [1436871302, "treasures of the savage frontier"
"1432579019" => [1436873631, "dungeon hack"
"1432578339" => [1436873631, "menzoberranzan"
"1207666813" => [1427292148, "pillars of eternity"
"1435848814" => [1440161275, "doom ii master levels"
"1435848742" => [1440161275, "final doom"
"1435829617" => [1440162836, "the elder scrolls adventures redguard"
"1435829464" => [1440163341, "an elder scrolls legend battlespire"
"1435828767" => [1440163901, "the elder scrolls iii morrowind goty edition"
"1435828982" => [1440163901, "the elder scrolls arena"
"1435829353" => [1440163901, "the elder scrolls chapter ii daggerfall"
"1440148836" => [1440166342, "fallout"
"1440151285" => [1440166436, "fallout 2"
"1440152063" => [1440163405, "fallout tactics"
"1435828198" => [1440166133, "quake the offering"
"1435827232" => [1440164514, "the ultimate doom"
"1438076423" => [1438343741, "frozen synapse"
"1442218265" => [1207665373, "the vanishing of ethan carter redux"
"1207665373" => [1207665373, "vanishing of ethan carter the"
"1442473063" => [1442477571, "system shock classic edition"
"1439995156" => [1442477571, "system shock enhanced edition"
"1441705046" => [1441705226, "wolfenstein 3d"
"1441705126" => [1441705226, "wolfenstein spear of destiny"
"1441704976" => [1443699418, "return to castle wolfenstein"
"1441704920" => [1443696086, "quake iii gold"
"1441704824" => [1443696817, "quake ii quad damage"
"1444731636" => [1423479583, "king arthur collection"
"1444731945" => [1423479583, "king arthur fallen champions"
"1443160514" => [1443160711, "falcon"
"1443160586" => [1443160711, "falcon at"
"1443160656" => [1443160711, "falcon gold"
"1432722131" => [1444390670, "champions of krynn"
"1432722998" => [1444390670, "dark queen of krynn the"
"1432722599" => [1444390670, "death knights of krynn"
"1432723859" => [1444390881, "dark sun shattered lands"
"1432903719" => [1444390881, "dark sun wake of the ravager"
"1432906190" => [1444391327, "ravenloft stone prophet"
"1432905053" => [1444391327, "ravenloft strahds possession"
"1444818876" => [1445852217, "pathologic classic hd"
"1441039631" => [1446131634, "x beyond the frontier"
"1441039809" => [1446131634, "x tension"
"1448989420" => [1449593992, "fallen enchantress"
"1445591825" => [1449593992, "fallen enchantress legendary heroes"
"1455298654" => [1455290087, "downfall redux"
"1455290259" => [1457346888, "konung 2 blood of titans"
"1455290088" => [1457346888, "konung legend of the north"
"1448013298" => [1268757981, "the incredible adventures of van helsing final cut"
"1439551206" => [1327823064, "frozen cortex game"
"1620402149" => [1995005660, "cossacks ii battle for europe"
"1360549960" => [1995005660, "cossacks ii napoleonic wars"
"1495134320" => [1640424747, "the witcher 3 wild hunt game of the year edition"
"1666511461" => [1856743450, "crysis warhead"
"2014921890" => [1856743450, "crysis wars"
"1266051739" => [1270048047, "tyranny"

Thanks for bringing this to my attention. I decided to add a note at the top instead of recreating the list, because it's just hacked together and doesn't need to cover all cases.

Thanks a lot for putting this together, incidentally I ended up using it as reference for a script I wrote (never though I'd see the day).

I'd like to make one small mention about [url=https://gogapidocs.readthedocs.io/en/latest/galaxy.html#get--products ]https://gogapidocs.readthedocs.io/en/latest/galaxy.html#get--products [/url], at least as it currently stands, the upper limit of ids you can include in a single request is set to 50. Anything above 50 will return the fabled GOGBear.

I'm having trouble with authentication.

Using this call:

auth?client_id=46899977096215655&layout=client2&redirect_uri=http%3A%2F%2F127.0.0.1%3A37431%2Ftoken&am p;response_t ype=code

I'm getting this response:

{"error":"redirect_uri_mismatch","error_description":"The redirect URI provided does not match registered URI(s)."}

Crap, they changed the way authentication works and it only allows registered URLs now. As we have no way to register our own clients, this makes everything a lot more complicated. I'll try to figure something out as soon as possible.