Display QPP payments by form as shortcode

qpp_payments.php

/**
 * Example of how to get payment records from QPP in a simple shortcode [qpp_demo_payments  form='name'].
 * Note this will not work after version 6 where CPTs will be used
 */
add_shortcode( 'qpp_demo_payments', function ( $atts ) {
	$atts     = shortcode_atts(
		array(
			'form' => '',
		), $atts );
	$payments = get_option( 'qpp_messages' . $atts['form'] );

	return '<pre>' . print_r( $payments, true ) . '</pre>';
} );