Add {company_or_name} tag for PDF Receipts.

company_or_name.php

<?php
/**
 * Add {company_or_name} tag to GiveWP PDF Receipts using the give_pdf_compiled_template_content filter.
 * Outputs the Company name if provided, otherwise outputs donor's full name.
 */
add_filter( 'give_pdf_compiled_template_content', function( $template_content, $args ) {
	//var_dump("<pre>".print_r($args,true)."</pre>");
	//
    // Make sure payment ID is available.
    $payment_id = ! empty( $args['donation_id'] ) ? absint( $args['donation_id'] ) : 0;
    if ( ! $payment_id ) {
        return $template_content;
    }
    
    // Get Company Name, if any.
    $company = $args['payment_meta']['_give_donation_company'];

    // Get donor name as fallback.
    $donor_name = trim( $args['payment_meta']['_give_donor_billing_first_name'] . ' ' . $args['payment_meta']['_give_donor_billing_last_name'] );
   

    // Set replacement value.
    $replacement = ! empty( $company ) ? esc_html( $company ) : esc_html( $donor_name );

    // Replace the tag in the template content.
    $template_content = str_replace( '{company_or_name}', $replacement, $template_content );

    return $template_content;
}, 999, 2 );