Function Call

Hi, skimming through the plugin code, you might try (untested):

if( function_exists( 'wpcf7_contact_form_tag_func' ) )
	echo wpcf7_contact_form_tag_func(
		[
			'id'         => 123,
			'title'      => '',
			'html_id'    => '',
			'html_name'  => '',
			'html_class' => '',
			'output'     => 'form'
		],
		'',
		'contact-form-7'
	);

or

if (   function_exists( 'wpcf7_contact_form' )
      && $contact_form = wpcf7_contact_form( $id = 123 )
)
	$contact_form->form_html(
		[
			'id'         => 123,
			'title'      => '',
			'html_id'    => '',
			'html_name'  => '',
			'html_class' => '',
			'output'     => 'form'
		]
 	);

where I assume PHP 5.4+.