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// Add Beaver Builder Templates to main product loop
add_action( 'fl_content_close', 'dg_add_bb_templates' );
function dg_add_bb_templates() {

    if ( is_woocommerce() ) {
    // Replace numbers with your own template IDs
        $templates = array( 1344, 1345, 1346 ); 

        foreach ($templates as $template) {
            FLBuilder::render_query( array(
                'post_type' => 'fl-builder-template',
                'p'         => $template
            ) );
        }

    }