diff --git a/Stripe/STPAPIClient.m b/Stripe/STPAPIClient.m
index c2a2dfdbd03..6fe75070786 100644
--- a/Stripe/STPAPIClient.m
+++ b/Stripe/STPAPIClient.m
@@ -414,8 +414,8 @@ + (PKPaymentRequest *)paymentRequestWithMerchantIdentifier:(NSString *)merchantI
     [paymentRequest setMerchantIdentifier:merchantIdentifier];
     [paymentRequest setSupportedNetworks:[self supportedPKPaymentNetworks]];
     [paymentRequest setMerchantCapabilities:PKMerchantCapability3DS];
-    [paymentRequest setCountryCode:countryCode];
-    [paymentRequest setCurrencyCode:currencyCode];
+    [paymentRequest setCountryCode:countryCode.uppercaseString];
+    [paymentRequest setCurrencyCode:currencyCode.uppercaseString];
     return paymentRequest;
 }