Add a PDF tag that outputs the donation leve description

give_add_donation_level_pdf_tag.php

<?php
use Give\ValueObjects\Money;
use Give\Donations\Models\Donation;
function give_add_donation_level_pdf_tag( $template_content, $args ) {
	
	// during testing, uncomment the next line to see a full printed array of the possible args that you can query
	//var_dump("<pre>".print_r($args,true)."</pre>");
	$level_label = '';
	$currency = give_get_option('currency');
	$form_id = give_get_payment_form_id( $args['donation_id'] );
	$donation_id = $args['donation_id'];
	$options = give()->form_meta->get_meta($form_id, '_give_donation_levels', true) ?? [];
	$donation = Donation::find($donation_id);
	
	 foreach ( $options as $option ) {
            if (isset($option['_give_amount'], $option['_give_text'])) {
                if (Money::of($option['_give_amount'], $currency )->getMinorAmount() == $donation->amount->getAmount()) {
                    $level_label = $option['_give_text'];
                }
            }
        }

	$template_content = str_replace( '{donation_level}', $level_label , $template_content );
	return $template_content;
}

add_filter( 'give_pdf_compiled_template_content', 'give_add_donation_level_pdf_tag', 999, 2 );