/// @file FIRParameterNames.h
///
/// Predefined event parameter names.
///
/// Params supply information that contextualize Events. You can associate up to 25 unique Params
/// with each Event type. Some Params are suggested below for certain common Events, but you are
/// not limited to these. You may supply extra Params for suggested Events or custom Params for
/// Custom events. Param names can be up to 40 characters long, may only contain alphanumeric
/// characters and underscores ("_"), and must start with an alphabetic character. Param values can
/// be up to 100 characters long. The "firebase_" prefix is reserved and should not be used.

/// Game achievement ID (NSString).
/// <pre>
///     NSDictionary *params = @{
///       kFIRParameterAchievementID : @"10_matches_won",
///       // ...
///     };
/// </pre>
static NSString *const kFIRParameterAchievementID = @"achievement_id";

/// Character used in game (NSString).
/// <pre>
///     NSDictionary *params = @{
///       kFIRParameterCharacter : @"beat_boss",
///       // ...
///     };
/// </pre>
static NSString *const kFIRParameterCharacter = @"character";

/// Type of content selected (NSString).
/// <pre>
///     NSDictionary *params = @{
///       kFIRParameterContentType : @"news article",
///       // ...
///     };
/// </pre>
static NSString *const kFIRParameterContentType = @"content_type";

/// Coupon code for a purchasable item (NSString).
/// <pre>
///     NSDictionary *params = @{
///       kFIRParameterCoupon : @"zz123",
///       // ...
///     };
/// </pre>
static NSString *const kFIRParameterCoupon = @"coupon";

/// Purchase currency in 3-letter <a href="http://en.wikipedia.org/wiki/ISO_4217#Active_codes">
/// ISO_4217</a> format (NSString).
/// <pre>
///     NSDictionary *params = @{
///       kFIRParameterCurrency : @"USD",
///       // ...
///     };
/// </pre>
static NSString *const kFIRParameterCurrency = @"currency";

/// Flight or Travel destination (NSString).
/// <pre>
///     NSDictionary *params = @{
///       kFIRParameterDestination : @"Mountain View, CA",
///       // ...
///     };
/// </pre>
static NSString *const kFIRParameterDestination = @"destination";

/// The arrival date, check-out date or rental end date for the item. This should be in
/// YYYY-MM-DD format (NSString).
/// <pre>
///     NSDictionary *params = @{
///       kFIRParameterEndDate : @"2015-09-14",
///       // ...
///     };
/// </pre>
static NSString *const kFIRParameterEndDate = @"end_date";

/// Flight number for travel events (NSString).
/// <pre>
///     NSDictionary *params = @{
///       kFIRParameterFlightNumber : @"ZZ800",
///       // ...
///     };
/// </pre>
static NSString *const kFIRParameterFlightNumber = @"flight_number";

/// Group/clan/guild ID (NSString).
/// <pre>
///     NSDictionary *params = @{
///       kFIRParameterGroupID : @"g1",
///       // ...
///     };
/// </pre>
static NSString *const kFIRParameterGroupID = @"group_id";

/// Item category (NSString).
/// <pre>
///     NSDictionary *params = @{
///       kFIRParameterItemCategory : @"t-shirts",
///       // ...
///     };
/// </pre>
static NSString *const kFIRParameterItemCategory = @"item_category";

/// Item ID (NSString).
/// <pre>
///     NSDictionary *params = @{
///       kFIRParameterItemID : @"p7654",
///       // ...
///     };
/// </pre>
static NSString *const kFIRParameterItemID = @"item_id";

/// The Google <a href="https://developers.google.com/places/place-id">Place ID</a> (NSString) that
/// corresponds to the associated item. Alternatively, you can supply your own custom Location ID.
/// <pre>
///     NSDictionary *params = @{
///       kFIRParameterItemLocationID : @"ChIJiyj437sx3YAR9kUWC8QkLzQ",
///       // ...
///     };
/// </pre>
static NSString *const kFIRParameterItemLocationID = @"item_location_id";

/// Item name (NSString).
/// <pre>
///     NSDictionary *params = @{
///       kFIRParameterItemName : @"abc",
///       // ...
///     };
/// </pre>
static NSString *const kFIRParameterItemName = @"item_name";

/// Level in game (signed 64-bit integer as NSNumber).
/// <pre>
///     NSDictionary *params = @{
///       kFIRParameterLevel : @(42),
///       // ...
///     };
/// </pre>
static NSString *const kFIRParameterLevel = @"level";

/// Location (NSString). The Google <a href="https://developers.google.com/places/place-id">Place ID
/// </a> that corresponds to the associated event. Alternatively, you can supply your own custom
/// Location ID.
/// <pre>
///     NSDictionary *params = @{
///       kFIRParameterLocation : @"ChIJiyj437sx3YAR9kUWC8QkLzQ",
///       // ...
///     };
/// </pre>
static NSString *const kFIRParameterLocation = @"location";

/// Number of nights staying at hotel (signed 64-bit integer as NSNumber).
/// <pre>
///     NSDictionary *params = @{
///       kFIRParameterNumberOfNights : @(3),
///       // ...
///     };
/// </pre>
static NSString *const kFIRParameterNumberOfNights = @"number_of_nights";

/// Number of passengers traveling (signed 64-bit integer as NSNumber).
/// <pre>
///     NSDictionary *params = @{
///       kFIRParameterNumberOfPassengers : @(11),
///       // ...
///     };
/// </pre>
static NSString *const kFIRParameterNumberOfPassengers = @"number_of_passengers";

/// Number of rooms for travel events (signed 64-bit integer as NSNumber).
/// <pre>
///     NSDictionary *params = @{
///       kFIRParameterNumberOfRooms : @(2),
///       // ...
///     };
/// </pre>
static NSString *const kFIRParameterNumberOfRooms = @"number_of_rooms";

/// Flight or Travel origin (NSString).
/// <pre>
///     NSDictionary *params = @{
///       kFIRParameterOrigin : @"Mountain View, CA",
///       // ...
///     };
/// </pre>
static NSString *const kFIRParameterOrigin = @"origin";

/// Purchase price (double as NSNumber).
/// <pre>
///     NSDictionary *params = @{
///       kFIRParameterPrice : @(1.0),
///       kFIRParameterCurrency : @"USD",  // e.g. $1.00 USD
///       // ...
///     };
/// </pre>
static NSString *const kFIRParameterPrice = @"price";

/// Purchase quantity (signed 64-bit integer as NSNumber).
/// <pre>
///     NSDictionary *params = @{
///       kFIRParameterQuantity : @(1),
///       // ...
///     };
/// </pre>
static NSString *const kFIRParameterQuantity = @"quantity";

/// Score in game (signed 64-bit integer as NSNumber).
/// <pre>
///     NSDictionary *params = @{
///       kFIRParameterScore : @(4200),
///       // ...
///     };
/// </pre>
static NSString *const kFIRParameterScore = @"score";

/// The search string/keywords used (NSString).
/// <pre>
///     NSDictionary *params = @{
///       kFIRParameterSearchTerm : @"periodic table",
///       // ...
///     };
/// </pre>
static NSString *const kFIRParameterSearchTerm = @"search_term";

/// Shipping cost (double as NSNumber).
/// <pre>
///     NSDictionary *params = @{
///       kFIRParameterShipping : @(9.50),
///       kFIRParameterCurrency : @"USD",  // e.g. $9.50 USD
///       // ...
///     };
/// </pre>
static NSString *const kFIRParameterShipping = @"shipping";

/// Sign up method (NSString).
/// <pre>
///     NSDictionary *params = @{
///       kFIRParameterSignUpMethod : @"google",
///       // ...
///     };
/// </pre>
static NSString *const kFIRParameterSignUpMethod = @"sign_up_method";

/// The departure date, check-in date or rental start date for the item. This should be in
/// YYYY-MM-DD format (NSString).
/// <pre>
///     NSDictionary *params = @{
///       kFIRParameterStartDate : @"2015-09-14",
///       // ...
///     };
/// </pre>
static NSString *const kFIRParameterStartDate = @"start_date";

/// Tax amount (double as NSNumber).
/// <pre>
///     NSDictionary *params = @{
///       kFIRParameterTax : @(1.0),
///       kFIRParameterCurrency : @"USD",  // e.g. $1.00 USD
///       // ...
///     };
/// </pre>
static NSString *const kFIRParameterTax = @"tax";

/// A single ID for a ecommerce group transaction (NSString).
/// <pre>
///     NSDictionary *params = @{
///       kFIRParameterTransactionID : @"ab7236dd9823",
///       // ...
///     };
/// </pre>
static NSString *const kFIRParameterTransactionID = @"transaction_id";

/// Travel class (NSString).
/// <pre>
///     NSDictionary *params = @{
///       kFIRParameterTravelClass : @"business",
///       // ...
///     };
/// </pre>
static NSString *const kFIRParameterTravelClass = @"travel_class";

/// A context-specific numeric value which is accumulated automatically for each event type. This is
/// a general purpose parameter that is useful for accumulating a key metric that pertains to an
/// event. Examples include revenue, distance, time and points. Value should be specified as signed
/// 64-bit integer or double as NSNumber. Notes: Currency-related values should be supplied using
/// double as NSNumber and must be accompanied by a @c kFIRParameterCurrency parameter. The valid
/// range of accumulated values is [-9,223,372,036,854.77, 9,223,372,036,854.77].
/// <pre>
///     NSDictionary *params = @{
///       kFIRParameterValue : @(3.99),
///       kFIRParameterCurrency : @"USD",  // e.g. $3.99 USD
///       // ...
///     };
/// </pre>
static NSString *const kFIRParameterValue = @"value";

/// Name of virtual currency type (NSString).
/// <pre>
///     NSDictionary *params = @{
///       kFIRParameterVirtualCurrencyName : @"virtual_currency_name",
///       // ...
///     };
/// </pre>
static NSString *const kFIRParameterVirtualCurrencyName = @"virtual_currency_name";