Sets the styling for the hosted field to the supplied styling attributes when focus on the hosted field in the iFrame is gained.
PaymentSession.setFocusStyle([<HostedFieldsRole>], styles)
PaymentSession.setFocusStyle(["card.number","card.securityCode"], { borderColor: 'red', borderWidth: '3px' });
An array of field roles for the hosted card fields, to be styled when the focus is gained. Valid array of field roles: ['card.number','card.securityCode', 'giftCard.number', 'giftCard.pin', 'ach.bankAccountNumber', 'ach.bankAccountHolder', 'ach.routingNumber']
An object containing JavaScript CSS properties.
None