Add an extra field to PowerPack's Registration Form module

functions.php

add_filter( 'pp_rf_fields', function( $fields, $settings, $id ) {
	if ( isset( $fields['consent'] ) ) {
		$consent = $fields['consent'];
		unset( $fields['consent'] );
	}

	$fields[] = array(
        'type' => 'text',
		'name' => 'company_name',
		'label' => 'Company Name',
		'placeholder' => 'Company Name',
	);

	if ( isset( $consent ) ) {
		$fields['consent'] = $consent;
	}

	return $fields;
}, 10, 3 );

add_action( 'pp_rf_user_register', function( $user_id, $data, $settings ) {
	if ( isset( $data['company_name'] ) ) {
        $company_name = sanitize_text_field( $data['company_name'] );
		update_user_meta( $user_id, 'company_name', $company_name );
	}
}, 10, 3 );