checkout
fun checkout(paymentMethod: PaymentMethod, paymentConsent: PaymentConsent?, cvc: String?, additionalInfo: Map<String, String>? = null, flow: AirwallexPaymentRequestFlow? = null): LiveData<AirwallexPaymentStatus>
suspend fun checkout(paymentMethod: PaymentMethod, additionalInfo: Map<String, String>? = null, flow: AirwallexPaymentRequestFlow? = null): AirwallexPaymentStatus