How add fonts to pdf

Please add this code inside the file functions.php of the theme.

if ( ! function_exists( 'ywraq_mpdf_args' ) ) {
    function ywraq_mpdf_args( $args ) {
        $defaultConfig = ( new Mpdf\Config\ConfigVariables() )->getDefaults();
        $fontDirs      = $defaultConfig['fontDir'];

        $defaultFontConfig = ( new Mpdf\Config\FontVariables() )->getDefaults();
        $fontData          = $defaultFontConfig['fontdata'];

        $args = array(

            'fontDir'           => array_merge(
                $fontDirs,
                array(
                    __DIR__ . '/woocommerce/mpdf_fonts/',
                )
            ),
            'fontdata'          => $fontData + array(
                    'opensans' => array(
                        'R'  => 'OpenSans-Regular.ttf',
                        'B'  => 'OpenSans-Bold.ttf',
                        'I'  => 'OpenSans-Italic.ttf',
                        'BI' => 'OpenSans-BoldItalic.ttf',

                    ),
                    'cookie'   => array(
                        'R'  => 'Cookie-Regular.ttf',
                        'B'  => 'Cookie-Regular.ttf',
                        'I'  => 'Cookie-Regular.ttf',
                        'BI' => 'Cookie-Regular.ttf',
                    ),
                ),
            'default_font'      => 'opensans',
            'default_font_size' => '12',
        );

        return $args;
    }

    add_filter( 'ywraq_mpdf_args', 'ywraq_mpdf_args' );
}

The fonts file should be uploaded inside the folder /woocommerce/mpdf_fonts/ of the theme

Use the array key of the font (i.e ‘cookie’ or ‘opensans’) to set the default font.