This page is just a reference of all the known Steam APIs, I do not know how they work. Please do not email me with questions.
https://api.steampowered.com/IStoreAppSimilarityService/IdentifyClustersFromPlaytime/v1/
NameValueTypeRequiredDescription
click to setstring Yes Access key
fixed64 No
int32 Noenum
int32 NoNumber of clusters to populare and return; if 0, all clusters will be returned
int32 NoWhen limiting the number of clusters, can change this seed to select a different cluster than the previous call.
StoreBrowseContext No
string No
int32 No
string No
StoreBrowseItemDataRequest NoIf passed, item data will be returned
bool No
bool No
bool No
bool No
bool No
bool No
bool No
int32 No
bool No
bool No
bool No
bool No
bool No
StoreBrowseItemDataRequest No
bool No
bool No
bool No
https://api.steampowered.com/IStoreAppSimilarityService/PrioritizeAppsForUser/v1/
NameValueTypeRequiredDescription
click to setstring Yes Access key
fixed64 No
string No
StoreItemID[] No
uint32 No
uint32 No
uint32 No
uint32 No
uint32 No
uint32 No
StoreAppSimilarityPriorityOptions No
double No
int32 No
int32 No
double No
int32 Noenum
int32 No
int64 No
uint32 No
bool No
bool No