Accept any string for currency code in PaymentRequest.

third_party/WebKit/Source/modules/payments/PaymentsValidators.h

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef PaymentsValidators_h
 #define PaymentsValidators_h
 
 #include "modules/ModulesExport.h"
 #include "public/platform/modules/payments/payment_request.mojom-blink.h"
 #include "wtf/Allocator.h"
 #include "wtf/text/WTFString.h"
 
 namespace blink {
 
 class MODULES_EXPORT PaymentsValidators final {
     STATIC_ONLY(PaymentsValidators);
 
 public:
-    // Returns true if |code| is a valid ISO 4217 currency code.
+    // The most common identifiers are three-letter alphabetic codes as defined by [ISO4217] (for example, "USD" for US Dollars)
+    // however any string of at most 2048 characters is considered valid. Returns false if currency |code| is too long (greater than 2048).
     static bool isValidCurrencyCodeFormat(const String& code, String* optionalErrorMessage);
 
     // Returns true if |amount| is a valid currency code as defined in ISO 20022 CurrencyAnd30Amount.
     static bool isValidAmountFormat(const String& amount, String* optionalErrorMessage);
 
     // Returns true if |code| is a valid ISO 3166 country code.
     static bool isValidCountryCodeFormat(const String& code, String* optionalErrorMessage);
 
     // Returns true if |code| is a valid ISO 639 language code.
     static bool isValidLanguageCodeFormat(const String& code, String* optionalErrorMessage);
 
     // Returns true if |code| is a valid ISO 15924 script code.
     static bool isValidScriptCodeFormat(const String& code, String* optionalErrorMessage);
 
     // Returns true if the payment address is valid:
     //  - Has a valid region code
     //  - Has a valid language code, if any.
     //  - Has a valid script code, if any.
     // A script code should be present only if language code is present.
     static bool isValidShippingAddress(const mojom::blink::PaymentAddressPtr&, String* optionalErrorMessage);
 };
 
 } // namespace blink
 
 #endif // PaymentsValidators_h