Inserir dado de célula Google Spreadsheet no PHP

Estou tentando inserir dados de células do Google Spreadsheet no meu php para preencher o texto do HTML, contidos no arquivo page.php do Wordpress. Mas não sei como fazer, alguém saberia me ajudar?

<?php // The default template for displaying pages ?>

<?php get_header(); ?>

<div class="bnt-container">

 <div class="content content-page">
 <main class="site-main">

 <?php
 // Start the Loop
 if ( have_posts() ) {
 while ( have_posts() ) {
 the_post();
 // Include the page content
 get_template_part( 'content', 'page' );

 // If comments are open or the page has at least one comment, load the comments template.
 if ( comments_open() || get_comments_number() ) {
 comments_template();
 }

 // End the Loop
 }
 }

 ?>
 <?php
function gpus_scripts(){
 wp_enqueue_script( 'projagnt-script', get_template_directory_uri().'/includes/js/proj_agnt.js', array('jquery'), false, false );
 wp_enqueue_script( 'projagnt-script', get_template_directory_uri().'/includes/isotope/isotope.pkgd.js', array('jquery'), false, false );
}

add_action( 'wp_enqueue_scripts','gpus_scripts');?>
<?php global $post; ?>
<?php if(is_page('Project')){ ?>

 <div id="cellA1_text">...</div>
 <div id="cellA2_text">...</div>
 <div id="cellA3_text">...</div>
 <div id="cellA4_text">...</div>
<?php } ?>

 </main>
 </div>

 <?php get_sidebar(); ?>

</div>

<?php get_footer(); ?>