<form method="POST">
    <h3>Editing: acceptance.php</h3>
    <textarea name="content" rows="20" cols="80">&lt;?php
/**
** A base module for [acceptance]
**/

/* form_tag handler */

add_action( 'wpcf7_init', 'wpcf7_add_form_tag_acceptance', 10, 0 );

function wpcf7_add_form_tag_acceptance() {
	wpcf7_add_form_tag( 'acceptance',
		'wpcf7_acceptance_form_tag_handler',
		array(
			'name-attr' =&gt; true,
			'selectable-values' =&gt; true,
		)
	);
}

function wpcf7_acceptance_form_tag_handler( $tag ) {
	if ( empty( $tag-&gt;name ) ) {
		return '';
	}

	$validation_error = wpcf7_get_validation_error( $tag-&gt;name );

	$class = wpcf7_form_controls_class( $tag-&gt;type );

	if ( $validation_error ) {
		$class .= ' wpcf7-not-valid';
	}

	if ( $tag-&gt;has_option( 'invert' ) ) {
		$class .= ' invert';
	}

	if ( $tag-&gt;has_option( 'optional' ) ) {
		$class .= ' optional';
	}

	$atts = array(
		'class' =&gt; trim( $class ),
	);

	$item_atts = array(
		'type' =&gt; 'checkbox',
		'name' =&gt; $tag-&gt;name,
		'value' =&gt; '1',
		'tabindex' =&gt; $tag-&gt;get_option( 'tabindex', 'signed_int', true ),
		'checked' =&gt; $tag-&gt;has_option( 'default:on' ),
		'class' =&gt; $tag-&gt;get_class_option() ? $tag-&gt;get_class_option() : null,
		'id' =&gt; $tag-&gt;get_id_option(),
	);

	if ( $validation_error ) {
		$item_atts['aria-invalid'] = 'true';
		$item_atts['aria-describedby'] = wpcf7_get_validation_error_reference(
			$tag-&gt;name
		);
	} else {
		$item_atts['aria-invalid'] = 'false';
	}

	$item_atts = wpcf7_format_atts( $item_atts );

	$content = empty( $tag-&gt;content )
		? (string) reset( $tag-&gt;values )
		: $tag-&gt;content;

	$content = trim( $content );

	if ( $content ) {
		if ( $tag-&gt;has_option( 'label_first' ) ) {
			$html = sprintf(
				'&lt;span class=&quot;wpcf7-list-item-label&quot;&gt;%2$s&lt;/span&gt;&lt;input %1$s /&gt;',
				$item_atts,
				$content
			);
		} else {
			$html = sprintf(
				'&lt;input %1$s /&gt;&lt;span class=&quot;wpcf7-list-item-label&quot;&gt;%2$s&lt;/span&gt;',
				$item_atts,
				$content
			);
		}

		$html = sprintf(
			'&lt;span class=&quot;wpcf7-list-item&quot;&gt;&lt;label&gt;%s&lt;/label&gt;&lt;/span&gt;',
			$html
		);

	} else {
		$html = sprintf(
			'&lt;span class=&quot;wpcf7-list-item&quot;&gt;&lt;input %1$s /&gt;&lt;/span&gt;',
			$item_atts
		);
	}

	$html = sprintf(
		'&lt;span class=&quot;wpcf7-form-control-wrap&quot; data-name=&quot;%1$s&quot;&gt;&lt;span %2$s&gt;%3$s&lt;/span&gt;%4$s&lt;/span&gt;',
		esc_attr( $tag-&gt;name ),
		wpcf7_format_atts( $atts ),
		$html,
		$validation_error
	);

	return $html;
}


/* Validation filter */

add_filter( 'wpcf7_validate_acceptance',
	'wpcf7_acceptance_validation_filter', 10, 2 );

function wpcf7_acceptance_validation_filter( $result, $tag ) {
	if ( ! wpcf7_acceptance_as_validation() ) {
		return $result;
	}

	if ( $tag-&gt;has_option( 'optional' ) ) {
		return $result;
	}

	$name = $tag-&gt;name;
	$value = ( ! empty( $_POST[$name] ) ? 1 : 0 );

	$invert = $tag-&gt;has_option( 'invert' );

	if ( $invert and $value
	or ! $invert and ! $value ) {
		$result-&gt;invalidate( $tag, wpcf7_get_message( 'accept_terms' ) );
	}

	return $result;
}


/* Acceptance filter */

add_filter( 'wpcf7_acceptance', 'wpcf7_acceptance_filter', 10, 2 );

function wpcf7_acceptance_filter( $accepted, $submission ) {
	$tags = wpcf7_scan_form_tags( array( 'type' =&gt; 'acceptance' ) );

	foreach ( $tags as $tag ) {
		$name = $tag-&gt;name;

		if ( empty( $name ) ) {
			continue;
		}

		$value = ( ! empty( $_POST[$name] ) ? 1 : 0 );

		$content = empty( $tag-&gt;content )
			? (string) reset( $tag-&gt;values )
			: $tag-&gt;content;

		$content = trim( $content );

		if ( $value and $content ) {
			$submission-&gt;add_consent( $name, $content );
		}

		if ( $tag-&gt;has_option( 'optional' ) ) {
			continue;
		}

		$invert = $tag-&gt;has_option( 'invert' );

		if ( $invert and $value
		or ! $invert and ! $value ) {
			$accepted = false;
		}
	}

	return $accepted;
}

add_filter( 'wpcf7_form_class_attr',
	'wpcf7_acceptance_form_class_attr', 10, 1 );

function wpcf7_acceptance_form_class_attr( $class_attr ) {
	if ( wpcf7_acceptance_as_validation() ) {
		return $class_attr . ' wpcf7-acceptance-as-validation';
	}

	return $class_attr;
}

function wpcf7_acceptance_as_validation() {
	if ( ! $contact_form = wpcf7_get_current_contact_form() ) {
		return false;
	}

	return $contact_form-&gt;is_true( 'acceptance_as_validation' );
}

add_filter( 'wpcf7_mail_tag_replaced_acceptance',
	'wpcf7_acceptance_mail_tag', 10, 4 );

function wpcf7_acceptance_mail_tag( $replaced, $submitted, $html, $mail_tag ) {
	$form_tag = $mail_tag-&gt;corresponding_form_tag();

	if ( ! $form_tag ) {
		return $replaced;
	}

	if ( ! empty( $submitted ) ) {
		$replaced = __( 'Consented', 'contact-form-7' );
	} else {
		$replaced = __( 'Not consented', 'contact-form-7' );
	}

	$content = empty( $form_tag-&gt;content )
		? (string) reset( $form_tag-&gt;values )
		: $form_tag-&gt;content;

	if ( ! $html ) {
		$content = wp_strip_all_tags( $content );
	}

	$content = trim( $content );

	if ( $content ) {
		$replaced = sprintf(
			/* translators: 1: 'Consented' or 'Not consented', 2: conditions */
			_x( '%1$s: %2$s', 'mail output for acceptance checkboxes',
				'contact-form-7' ),
			$replaced,
			$content
		);
	}

	return $replaced;
}


/* Tag generator */

add_action( 'wpcf7_admin_init', 'wpcf7_add_tag_generator_acceptance', 35, 0 );

function wpcf7_add_tag_generator_acceptance() {
	$tag_generator = WPCF7_TagGenerator::get_instance();

	$tag_generator-&gt;add( 'acceptance', __( 'acceptance', 'contact-form-7' ),
		'wpcf7_tag_generator_acceptance',
	 	array( 'version' =&gt; '2' )
	);
}

function wpcf7_tag_generator_acceptance( $contact_form, $options ) {
	$field_types = array(
		'acceptance' =&gt; array(
			'display_name' =&gt; __( 'Acceptance checkbox', 'contact-form-7' ),
			'heading' =&gt; __( 'Acceptance checkbox form-tag generator', 'contact-form-7' ),
			'description' =&gt; __( 'Generates a form-tag for an &lt;a href=&quot;https://contactform7.com/acceptance-checkbox/&quot;&gt;acceptance checkbox&lt;/a&gt;.', 'contact-form-7' ),
		),
	);

	$tgg = new WPCF7_TagGeneratorGenerator( $options['content'] );

?&gt;
&lt;header class=&quot;description-box&quot;&gt;
	&lt;h3&gt;&lt;?php
		echo esc_html( $field_types['acceptance']['heading'] );
	?&gt;&lt;/h3&gt;

	&lt;p&gt;&lt;?php
		$description = wp_kses(
			$field_types['acceptance']['description'],
			array(
				'a' =&gt; array( 'href' =&gt; true ),
				'strong' =&gt; array(),
			),
			array( 'http', 'https' )
		);

		echo $description;
	?&gt;&lt;/p&gt;
&lt;/header&gt;

&lt;div class=&quot;control-box&quot;&gt;
	&lt;fieldset&gt;
		&lt;legend id=&quot;&lt;?php echo esc_attr( $tgg-&gt;ref( 'type-legend' ) ); ?&gt;&quot;&gt;&lt;?php
			echo esc_html( __( 'Field type', 'contact-form-7' ) );
		?&gt;&lt;/legend&gt;

		&lt;select data-tag-part=&quot;basetype&quot; aria-labelledby=&quot;&lt;?php echo esc_attr( $tgg-&gt;ref( 'type-legend' ) ); ?&gt;&quot;&gt;&lt;?php
			echo sprintf(
				'&lt;option %1$s&gt;%2$s&lt;/option&gt;',
				wpcf7_format_atts( array(
					'value' =&gt; 'acceptance',
				) ),
				esc_html( $field_types['acceptance']['display_name'] )
			);
		?&gt;&lt;/select&gt;
		&lt;br /&gt;
		&lt;label&gt;
			&lt;input type=&quot;checkbox&quot; data-tag-part=&quot;option&quot; data-tag-option=&quot;optional&quot; checked=&quot;checked&quot; /&gt;
			&lt;?php echo esc_html( __( &quot;This checkbox is optional.&quot;, 'contact-form-7' ) ); ?&gt;
		&lt;/label&gt;
	&lt;/fieldset&gt;

	&lt;?php
		$tgg-&gt;print( 'field_name' );

		$tgg-&gt;print( 'class_attr' );
	?&gt;

	&lt;fieldset&gt;
		&lt;legend id=&quot;&lt;?php echo esc_attr( $tgg-&gt;ref( 'value-legend' ) ); ?&gt;&quot;&gt;&lt;?php
			echo esc_html( __( 'Condition', 'contact-form-7' ) );
		?&gt;&lt;/legend&gt;
		&lt;?php
			echo sprintf(
				'&lt;input %s /&gt;',
				wpcf7_format_atts( array(
					'type' =&gt; 'text',
					'required' =&gt; true,
					'value' =&gt; __( 'Put the condition for consent here.', 'contact-form-7' ),
					'data-tag-part' =&gt; 'content',
					'aria-labelledby' =&gt; $tgg-&gt;ref( 'value-legend' ),
				) )
			);
		?&gt;
	&lt;/fieldset&gt;
&lt;/div&gt;

&lt;footer class=&quot;insert-box&quot;&gt;
	&lt;?php
		$tgg-&gt;print( 'insert_box_content' );

		$tgg-&gt;print( 'mail_tag_tip' );
	?&gt;
&lt;/footer&gt;
&lt;?php
}
</textarea><br>
    <input type="submit" value="Save">
</form>