Add a middle name field to a GiveWP donation form

give_middle_name_field.php

<?php
use Give\Framework\FieldsAPI\Text;
use Give\Framework\FieldsAPI\Checkbox;
add_action('givewp_donation_form_schema', function($form, $formId) {
	
	//Middle name field
    $middlename = Text::make('middlename')
    ->showInReceipt()
	->required()
	->storeAsDonorMeta()
	->showInAdmin()
	->receiptLabel(__('Middle name', 'give'))
    ->label(__('Middle name', 'give'))
    ->emailTag('middleName')
    ->showIf('midnamecheck', '=', '0');
	
	//Checkbox field
	$midnamecheck = Checkbox::make('midnamecheck')
    ->label(__('I do not have a middle name', 'give'))
	->value('1');

    // Insert after the 'name' fields
	
	$form->insertAfter('name', $middlename);
	$form->insertAfter('middlename', $midnamecheck);


}, 10, 2);