Change the Donation Receipt text in Receipt page of GiveWP

functions.php

/**
 * Call before the Donation Receipt text is display
 */
function give_custom_give_payment_receipt_header_before_callback() {
	add_filter( 'gettext', 'child_give_text_switcher', 10, 3 );
}
add_action( 'give_payment_receipt_header_before', 'give_custom_give_payment_receipt_header_before_callback' );


/**
 * Remove the filter after the text is display
 */
function give_custom_give_payment_receipt_header_after_callback() {
	remove_filter( 'gettext', 'child_give_text_switcher', 10 );
}
add_action( 'give_payment_receipt_header_after', 'give_custom_give_payment_receipt_header_after_callback' );

/**
 * Change Name in Donation receipt page
 */
function child_give_text_switcher( $translations, $text, $domain ) {

	if ( $domain == 'give' && $text == 'Donation Receipt' ) {
		$translations = 'ADD TEXT HERE';
	}
	
	return $translations;
}