Show address fields when specific payment method is selected

show_address_fields_when_specific_payment_method_is_selected.php

class TEMP_WFACP_Conditional_Field_Depend_On_Payment {

	private $conditional_field = [];
	private $exclude_wfacp_ids = [];

	/**
	 * @var string Payment method bank transfer selected then show fields
	 */
	private $payment_method_selected = 'fkwcs_stripe_klarna';

	public function __construct() {
		$this->conditional_field = [
			'payment_method' => [
				[
					'value'  => $this->payment_method_selected,
					'fields' => [ 'billing_address_1', 'billing_address_2', 'billing_state', 'billing_city', 'billing_postcode', 'billing_country' ],
					'enable' => true,
				]
			]
		];
		add_action( 'wfacp_after_checkout_page_found', [ $this, 'wfacp_add_script' ] );
		add_filter( 'woocommerce_checkout_fields', [ $this, 'wfacp_remove_required' ], 9, 1 );
	}

	function wfacp_add_script() {
		if ( in_array( WFACP_Common::get_id(), $this->exclude_wfacp_ids ) ) {
			return;
		}
		add_action( 'wp_footer', [ $this, 'wfacp_conditional_field_script' ] );
	}

	function wfacp_conditional_field_script() {
		$fields = json_encode( $this->conditional_field );
		?>
        <style>
            p.conditional_field {
                display: none !important;
            }
        </style>
        <script>
            jQuery(document).ready(function ($) {
                var conditional_fields = <?php echo $fields; ?>;
                conditionField();

                function conditionField() {
                    $.each(conditional_fields, function (field, values) {
                        $.each(values, function (key, value) {
                            var payment_method = $("input[name=payment_method]:checked").val();
                            var field = 'payment_method_' + payment_method;

                            displayConditionalField(field, value, payment_method);

                            $(document.body).on('change', '.wc_payment_method .input-radio', function () {
                                var id = $(this).attr('id');
                                var val = $(this).val();
                                displayConditionalField(id, value, val);
                            });
                        });
                    });
                }

                function displayConditionalField(id, values, val) {
                    $.each(values.fields, function (index, field) {
                        var show = false;
                        if (val === 'null') {
                            val = $('#' + id).val();
                        }
                        if (val === values.value) {
                            show = true;
                        }
                        if (show && values.enable) {
                            $('#' + field + '_field').removeClass('conditional_field');
                        } else {
                            $('#' + field + '_field').addClass('conditional_field');
                        }
                    });
                }
            });
        </script>
		<?php
	}

	function wfacp_remove_required( $fields ) {
		if ( ! class_exists( 'WFACP_Common' ) || in_array( WFACP_Common::get_id(), $this->exclude_wfacp_ids ) ) {
			return $fields;
		}

		// If payment method is NOT bacs, remove required from these shipping fields
		if ( isset( $_POST['payment_method'] ) && $this->payment_method_selected !== $_POST['payment_method'] ) {
			$shipping_fields_to_modify = [ 'shipping_address_1', 'shipping_address_2', 'shipping_city', 'shipping_country' ];

			foreach ( $shipping_fields_to_modify as $field_id ) {
				if ( isset( $fields['shipping'][ $field_id ] ) ) {
					unset( $fields['shipping'][ $field_id ]['required'] );
				}
			}
		}

		return $fields;
	}
}

new TEMP_WFACP_Conditional_Field_Depend_On_Payment();