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Overview

Set the PrimerHeadlessUniversalCheckoutUIDelegate in order to receive callbacks from Primer SDK about UI events.

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primerHeadlessUniversalCheckoutUIDidStartPreparation

This method will be called when the SDK starts preparing to tokenize the payment method. 
func primerHeadlessUniversalCheckoutUIDidStartPreparation(for paymentMethodType: String)

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primerHeadlessUniversalCheckoutUIDidShowPaymentMethod

This method will be called when the payment method UI gets displayed. 
func primerHeadlessUniversalCheckoutUIDidShowPaymentMethod(for paymentMethodType: String)