Extend Formidable Forms entries list with Pronamic Pay payment info/status.

functions.php

<?php

/**
 * Formidable Forms.
 * 
 * @link https://github.com/Strategy11/formidable-forms/blob/v5.0.01/classes/controllers/FrmEntriesController.php#L31
 * @link https://github.com/Strategy11/formidable-forms/blob/v5.0.01/classes/helpers/FrmEntriesListHelper.php#L289-L293
 */
$screen = 'formidable_page_formidable-entries';

\add_filter( 'manage_' . $screen . '_columns', function( $columns ) {
	$columns['pronamic_payment_status'] = __( 'Pronamic Payment Status', 'your-text-domain' );

	return $columns;
}, 20 );

$column_name = 'pronamic_payment_status';

\add_filter( 'frm_entries_' . $column_name . '_column', function( $value, $data ) {
	if ( ! \array_key_exists( 'item', $data ) ) {
		return $value;
	}

	$item = $data['item'];

	$payment = \reset( \get_pronamic_payments_by_source( 'formidable-forms', $item->id ) );

	if ( false === $payment ) {
		return;
	}

	return \print_r( $payment, true );
}, 20, 2 );