Model/Adminhtml/Source/ApplePayNetworks.php
public function toOptionArray() {
        return [
            [
                'value' => self::CARD_VISA,
                'label' => __('Visa')
            ],
            [
                'value' => self::CARD_MASTERCARD,
                'label' => __('Mastercard')
            ],
            [
                'value' => self::CARD_AMEX,
                'label' => __('American Express')
            ],
        ];
    }
public function toOptionArray() {
        return [
            [
                'value' => self::CARD_VISA,
                'label' => __('Visa')
            ],
            [
                'value' => self::CARD_MASTERCARD,
                'label' => __('Mastercard')
            ],
            [
                'value' => self::CARD_AMEX,
                'label' => __('American Express')
            ],
        ];
    }
public function toOptionArray ( ) { return [ [ 'value' => self :: CARD_VISA , 'label' => __ ( 'Visa' ) ] , [ 'value' => self :: CARD_MASTERCARD , 'label' => __ ( 'Mastercard' ) ] , [ 'value' => self :: CARD_AMEX , 'label' => __ ( 'American Express' ) ] , ] ; }
Possible Apple Pay Cards

@return array
Possible Apple Pay Cards