ICheckoutService – Steam Web API Documentation

UNDOCUMENTEDPOST

https://api.steampowered.com/ICheckoutService/AddFreeLicense/v1/

Name	Value	Type	Required	Description
key	click to set	string	Yes	Access key
item_id		StoreItemID	No
↳ appid		uint32	No
↳ packageid		uint32	No
↳ bundleid		uint32	No
↳ tagid		uint32	No
↳ creatorid		uint32	No
↳ hubcategoryid		uint32	No

UNDOCUMENTED

https://api.steampowered.com/ICheckoutService/GetFriendOwnershipForGifting/v1/

Name	Value	Type	Required	Description
key	click to set	string	Yes	Access key
item_ids[0]		StoreItemID[]	No
↳ appid		uint32	No
↳ packageid		uint32	No
↳ bundleid		uint32	No
↳ tagid		uint32	No
↳ creatorid		uint32	No
↳ hubcategoryid		uint32	No

UNDOCUMENTED

https://api.steampowered.com/ICheckoutService/ValidateCart/v1/

Name	Value	Type	Required	Description
key	click to set	string	Yes	Access key
gidshoppingcart		int64	No
context		StoreBrowseContext	No
↳ language		string	No
↳ elanguage		int32	No
↳ country_code		string	No
data_request		StoreBrowseItemDataRequest	No
↳ include_assets		bool	No
↳ include_release		bool	No
↳ include_platforms		bool	No
↳ include_all_purchase_options		bool	No
↳ include_screenshots		bool	No
↳ include_trailers		bool	No
↳ include_ratings		bool	No
↳ include_tag_count		int32	No
↳ include_reviews		bool	No
↳ include_basic_info		bool	No
↳ include_supported_languages		bool	No
↳ include_full_description		bool	No
↳ include_included_items		bool	No
↳ included_item_data_request		StoreBrowseItemDataRequest	No
↳ include_assets_without_overrides		bool	No
↳ apply_user_filters		bool	No
↳ include_links		bool	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
gidreplayoftransid		fixed64	No
for_init_purchase		bool	No