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.

Add a special payment for an appid/gameitemid.

https://partner.steam-api.com/IWorkshopService/AddSpecialPayment/v1/
NameValueTypeRequiredDescription
click to setstring Yes Access key
uint32 Yes AppID
uint32 Yes Game Item ID
string Yes YYY-MM-DD formatted string
uint64 Yes US Payment portion in USD Cents
uint64 Yes ROW Payment portion in USD Cents

Get a list of contributors for a specific gameitemid/app combination.

https://partner.steam-api.com/IWorkshopService/GetFinalizedContributors/v1/
NameValueTypeRequiredDescription
click to setstring Yes Access key
uint32 Yes
uint32 Yes

Get item revenue for a specific app/item definition for a date range.

https://partner.steam-api.com/IWorkshopService/GetItemDailyRevenue/v1/
NameValueTypeRequiredDescription
click to setstring Yes Access key
uint32 Yes
uint32 Yes
uint32 Yes
uint32 Yes

Populate block of item descriptions.

https://partner.steam-api.com/IWorkshopService/PopulateItemDescriptions/v1/
NameValueTypeRequiredDescription
click to setstring Yes Access key
uint32 Yes
{message} Yes

Set item payment rules.

https://partner.steam-api.com/IWorkshopService/SetItemPaymentRules/v1/
NameValueTypeRequiredDescription
click to setstring Yes Access key
uint32 Yes
uint32 Yes
{message} Yes
{message} Yes
bool NoOnly validates the rules and does not persist them.
bool Yes
{message} Yes