#import <UIKit/UIKit.h>


typedef enum PayPalEnvironment {
 ENV_LIVE,
 ENV_SANDBOX,
 ENV_NONE,
} PayPalEnvironment;

typedef enum PayPalButtonType {
 BUTTON_118x24,
 BUTTON_152x33,
 BUTTON_194x37,
 BUTTON_278x43,
 BUTTON_294x43,
 BUTTON_TYPE_COUNT,
}PayPalButtonType;

@protocol DeviceReferenceTokenDelegate <NSObject>

@required
- (void)receivedDeviceReferenceToken:(NSString *)token;
- (void)couldNotFetchDeviceReferenceToken; //Check the errorMessage property to see what 
                                           //the problem was.

@end


@interface PayPal : NSObject <UIWebViewDelegate> {
 @private
 BOOL initialized;//Determines if the initialization call has finished and the PayPal 
                  //object is initialized.
 BOOL paymentsEnabled;
 NSString *appID;
 NSString *lang;
 PayPalEnvironment environment;
 
 NSString *errorMessage;
 NSMutableArray *payButtons;
 
 id<DeviceReferenceTokenDelegate> delegate;
}

@property (nonatomic, retain) NSString *lang;
@property (nonatomic, retain) NSString *errorMessage;
@property (nonatomic, retain) NSMutableArray *payButtons;

@property (nonatomic, readonly) NSString *appID;
@property (nonatomic, readonly) BOOL initialized;
@property (nonatomic, readonly) BOOL paymentsEnabled;
@property (nonatomic, readonly) PayPalEnvironment environment;

+ (PayPal*)getInstance;

- (void)fetchDeviceReferenceTokenWithAppID:(NSString const *)
inAppID forEnvironment:(PayPalEnvironment)env 
withDelegate:(id<DeviceReferenceTokenDelegate>)del;
- (void)fetchDeviceReferenceTokenWithAppID:(NSString const *)
inAppID withDelegate:(id<DeviceReferenceTokenDelegate>)del;

- (UIButton *)getPayButtonWithTarget:(NSObject const *)target andAction:(SEL)action 
andButtonType:(PayPalButtonType)inButtonType;

@end

A full example of using the MEC library for an online pizza delivery service application can be found in the library download at https://www.x.com/community/ppx/xspaces/mobile/mobile_ec.