Steam Item information

Each game must provide a persistent 64-bit ID for each asset that can be traded to another user. At a minimum this asset ID must be unique within the context that contains the asset ID.
Steam reserves the top two bits of each context ID for its own use. Context IDs returned by an asset server must be zero in the top two bits.
All contexts defined by the asset server must also have a non-zero context ID. APIs that return context IDs must not specify a value of zero.
Contexts provide a way to break up items into different categories, what kind of categories depend on the implementation.

App ID (appid) -			The integer id for a game
Context ID (contextid) -	A way to organize / categorize items/assets/currency. This is just an integer but steam documentation highlights a way to make it somewhat folder based by splitting the integer into bits ranges and using each bit range to denote something diffrent.
Class ID (classid) -		An ID that identifies an item class whose properties are all the same for all items with that class id.
Instance ID (instanceid) -	An ID that describes an item instance that inherits properties from a class with the class id being noted in the instance.
Asset ID (assetid) -		A unique identifier for an asset (item). This asset will have it's own id, and also a class id and instance id to point to the actual representation of the item. Asset objects can also have amount properties to specify how much of <classid>_<instanceid> the user has for stackable items. Asset IDs can also change when an item is traded, although the classid and instanceid should stay the same.
Currency ID (currencyid) -	An ID that identifies a custom currency created by and implemented by the game. This id will stay the same everywhere, unlike asset ids.
Definition ID (defid) -		An id unique to the app scope that steam uses internally to map items to attributes in a schema file.

Each asset in the Steam Economy can be uniquely identified by the combination of three numbers: App ID, Context ID, and Asset ID


Item class_instance Info
	icon_url			If the icon_url is not a url then prefix this url to the value of icon_url "https://steamcommunity-a.akamaihd.net/economy/image/"
						And to get different sizes one can add a "/" to the end of the url and attach the dimensions the app wishes to retrieve the image as.
						This will resize the image to fit within the given dimensions maintaining the aspect ratio of the original image.
						If one wants to force dimensions for an image just add an f after the dimension, /300fx50
							This will still resize the image to fit within the given dimensions maintaining the aspect ratio, but it will be centered within the given dimensions and the complete image will have given dimensions.
	icon_drag_url		The icon image that should be used when the item is being dragged by a mouse cursor or touch event. If value is an empty string then just use the value of icon_url
	tradeable			Whether or not the asset / currency is tradeable
	marketable			Whether or not the asset / currency can be sold in the steam marktplace
	name				The name of the asset / currency
	name_color			The color of the text the name should be displayed in and also the color of accents such as the border for the item.
	background_color	The background color the item / icon should be displayed on.
	market_name			The name of the item when viewed in the marketplace.
	type				The type of item, this value is suitable for presentation.
	fraudwarnings		A list of fraud warning objects that should be displayed to a user to alert the of potential malicious activity.
	descriptions		An array of description objects that should be displayed with the item when its details are viewed.
						Description objects normally have 2 properties "type", and "value" but may have any of the properties listed below, or not listed.
						type
							values:
							html - Represents an HTML block element

						value
							The value to use as type

						color
							if type = html then the color of the text for that html object

						app_data
							Data that is relevant to the game that pertains to this description.
	actions				A list of action objects that can be used to take an action on an item.
						An action object normally has 2 properties, "name" and "link"
						name - display name of the action eg "Inspect in Game"
						link - The link to execute to perform the action, this may not even be http, it could be any valid uri protocol registered on the local computer.
	market_actions		A list of action objects that can be used to take an action on the item when viewed from the steam marketplace. Action objects are the same as described in the "actions" section.
	tags				A list of tag objects that allow for advanced filtering when viewing items in an inventory setting.
						A tag object normally has 4 properties: "internal_name", "name", "category", and "category_name"
						internal_name	Name used internally by the game and filtering functions of the inventory.
						name			Name to be displayed to the user as a filter.
						category		The internal name of the category the tag filter should be listed under
						category_name	The name to be displayed to the user as the category.
						color			The color to display the text as.
						Tag objects can be thought of as a list of key value pairs where item.category = internal_name

	Any of the above listed properties can be overwritten by instance data allowing for unique values per instance.