IAccountCartService

UNDOCUMENTEDPOST

https://api.steampowered.com/IAccountCartService/AddItemsToCart/v1/

Name	Value	Type	Required	Description
key	click to set	string	Yes	Access key
user_country		string	No
items		CAccountCart_AddItemsToCart_Request_ItemToAdd	No
navdata		CUserInterface_NavData	No
↳ domain		string	No
↳ controller		string	No
↳ method		string	No
↳ submethod		string	No
↳ feature		string	No
↳ depth		uint32	No
↳ countrycode		string	No
↳ webkey		uint64	No
↳ is_client		bool	No
↳ curator_data		CUserInterface_CuratorData	No
↳ clanid		uint32	No
↳ listid		uint64	No
↳ is_likely_bot		bool	No
↳ is_utm		bool	No
items[0]		CAccountCart_AddItemsToCart_Request_ItemToAdd[]	No
↳ packageid		uint32	No
↳ bundleid		uint32	No
↳ gift_info		CartGiftInfo	No
↳ flags		AccountCartLineItemFlags	No
↳ is_gift		bool	No
↳ is_private		bool	No

UNDOCUMENTEDPOST

https://api.steampowered.com/IAccountCartService/GetRelevantCoupons/v1/

Name	Value	Type	Required	Description
key	click to set	string	Yes	Access key
language		uint32	No

UNDOCUMENTEDPOST

https://api.steampowered.com/IAccountCartService/MergeShoppingCartContents/v1/

Name	Value	Type	Required	Description
key	click to set	string	Yes	Access key
gidshoppingcart		fixed64	No
user_country		string	No

UNDOCUMENTEDPOST

https://api.steampowered.com/IAccountCartService/ModifyLineItem/v1/

Name	Value	Type	Required	Description
key	click to set	string	Yes	Access key
line_item_id		uint64	No
user_country		string	No
gift_info		CartGiftInfo	No
↳ accountid_giftee		int32	No
↳ gift_message		CartGiftMessage	No
↳ gifteename		string	No
↳ message		string	No
↳ sentiment		string	No
↳ signature		string	No
↳ time_scheduled_send		int32	No
flags		AccountCartLineItemFlags	No
↳ is_gift		bool	No
↳ is_private		bool	No
apply_gidcoupon		uint64	No

UNDOCUMENTEDPOST

https://api.steampowered.com/IAccountCartService/RemoveItemFromCart/v1/

Name	Value	Type	Required	Description
key	click to set	string	Yes	Access key
line_item_id		uint64	No
user_country		string	No

Steam Web API Documentation