[[AffirmConfiguration sharedInstance] configureWithPublicKey:@"PUBLIC_API_KEY" locale:AffirmLocaleUS environment:AffirmEnvironmentSandbox merchantName:@"Affirm Example"];

// initialize an AffirmItem with item details
AffirmItem *item = [AffirmItem itemWithName:@"Affirm Test Item" SKU:@"test_item" unitPrice:price quantity:1 URL:[NSURL URLWithString:@"http://sandbox.affirm.com/item"]];

// initialize an AffirmShippingDetail with the user's shipping address
AffirmShippingDetail *shipping = [AffirmShippingDetail shippingDetailWithName:@"Chester Cheetah" addressWithLine1:@"633 Folsom Street" line2:@"" city:@"San Francisco" state:@"CA" zipCode:@"94107" countryCode:@"USA"];

// initialize an AffirmCheckout object with the item(s), shipping details, tax amount, shipping amount, discounts, financing program, and order ID
AffirmCheckout *checkout = [[AffirmCheckout alloc] initWithItems:@[item] shipping:shipping taxAmount:[NSDecimalNumber zero] shippingAmount:[NSDecimalNumber zero] discounts:nil metadata:nil financingProgram:nil orderId:@"JKLMO4321"];

// The minimum requirements are to initialize the AffirmCheckout object with the item(s), shipping details, and payout Amount
AffirmCheckout *checkout = [AffirmCheckout checkoutWithItems:@[item] shipping:shipping payoutAmount:price];

// initialize an UINavigationController with the checkout object and present it
AffirmCheckoutViewController *checkoutViewController = [[AffirmCheckoutViewController alloc] initWithDelegate:self checkout:checkout useVCN:NO getReasonCodes:NO cardAuthWindow:10];
UINavigationController *nav = [[UINavigationController alloc] initWithRootViewController:checkoutViewController];
[self presentViewController:nav animated:YES completion:nil];

// It is recommended that you round the total in the checkout request to two decimal places. Affirm SDK converts the float total to integer cents before initiating the checkout, so may round up or down depending on the decimal places. Ensure that the rounding in your app uses the same calculation across your other backend systems, otherwise, it may cause an error of 1 cent or more in the total validation on your end. 

self.promotionalButton = [[AffirmPromotionalButton alloc] initWithPromoID:nil
                                                                  showCTA:YES
                                                                 pageType:AffirmPageTypeProduct
                                                 presentingViewController:self
                                                                    frame:CGRectMake(0, 0, 315, 34)];
[self.stackView insertArrangedSubview:self.promotionalButton atIndex:0];

[self.promotionalButton configureByHtmlStylingWithAmount:[NSDecimalNumber decimalNumberWithString:amountText]
                                          affirmLogoType:AffirmLogoTypeName
                                             affirmColor:AffirmColorTypeBlue
                                           remoteFontURL:fontURL
                                            remoteCssURL:cssURL];

self.promotionalButton.configure(amount: NSDecimalNumber(string: amountText),
                         affirmLogoType: .name,
                            affirmColor: .blue,
                                   font: UIFont.italicSystemFont(ofSize: 15),
                              textColor: .gray)

[self.promotionalButton configureWithHtmlString:html
                                         amount:amount
                                  remoteFontURL:fontURL
                                   remoteCssURL:cssURL];

@font-face
{
font-family: 'OpenSansCondensed-Bold';
src: local('OpenSansCondensed-Bold'),url('OpenSansCondensed-Bold.ttf') format('truetype');
}

body {
font-family: 'OpenSansCondensed-Light';
font-weight: normal;
!important;
}

AffirmPromoModalViewController *viewController = [[AffirmPromoModalViewController alloc] initWithPromoId:@"promo_id" amount:amount delegate:delegate];
UINavigationController *nav = [[UINavigationController alloc] initWithRootViewController:viewController];
[self.presentingViewController presentViewController:nav animated:YES completion:nil];

NSDecimalNumber *dollarPrice = [NSDecimalNumber decimalNumberWithString:self.amountTextField.text];
[AffirmDataHandler getPromoMessageWithPromoID:nil
                                       amount:dollarPrice
                                      showCTA:YES
                                     pageType:AffirmPageTypeBanner
                                     logoType:AffirmLogoTypeName
                                    colorType:AffirmColorTypeBlue
                                         font:[UIFont boldSystemFontOfSize:15]
                                    textColor:[UIColor grayColor]
                     presentingViewController:self
                            completionHandler:^(NSAttributedString *attributedString, UIViewController *viewController, NSError *error) {
                                [self.promoButton setAttributedTitle:attributedString forState:UIControlStateNormal];
                                self.promoViewController = viewController;
}];

UINavigationController *nav = [[UINavigationController alloc] initWithRootViewController:self.promoViewController];
[self presentViewController:nav animated:YES completion:nil];

[AffirmOrderTrackerViewController trackOrder:order products:@[product0, product1]];