How to save the custom field data in payment section magento 2 to payment related table?

Question

I am trying to save the payment related custom data in additional_information column through my custom module.can any one help me on this. Observer class

namespace Vendor\Module\Observer;
use Magento\Framework\Event\ObserverInterface;
use Magento\Quote\Api\Data\PaymentInterface;

class PaymentAssignData implements ObserverInterface {

    protected $_request;

    /**
     * @var ObjectManagerInterface
     */
    protected $_objectManager;

    /**
     * @param \Magento\Framework\ObjectManagerInterface $objectManager
     */
    public function __construct(
    \Magento\Framework\ObjectManagerInterface $objectManager, \Psr\Log\LoggerInterface $logger, \Magento\Quote\Model\QuoteFactory $quoteFactory, \Magento\Framework\App\RequestInterface $request
    ) {
        //die(__METHOD__);
        $this->_objectManager = $objectManager;
        $this->logger = $logger;
        $this->quoteFactory = $quoteFactory;
        $this->_request = $request;
    }

    /**
     * customer register event handler
     *
     * @param \Magento\Framework\Event\Observer $observer
     * @return void
     */
    public function execute(\Magento\Framework\Event\Observer $observer) {
        $order = $observer->getEvent()->getOrder();
        $addInfo = $order->getPayment()->getData();
        var_dump(json_encode($addInfo));
        exit;
        $quoteRepository = $this->_objectManager->create('Magento\Quote\Model\QuoteRepository');
        /** @var \Magento\Quote\Model\Quote $quote */
        var_dump(json_encode($observer));
        exit;
        $quote = $quoteRepository->get($order->getQuoteId());
        $order->setDeliveryDate($quote->getDeliveryDate());





        $order = $observer->getEvent()->getOrder();
        //$quote = $order->getQuote();
        $quoteId = $order->getQuoteId();
        $payment = $order->getPayment()->getData('additional_data');
        $quote = $this->quoteFactory->create()->load($quoteId);
        // $postData = $this->_request->getParam();;
        var_dump($payment);
        exit;
        // var_dump($quoteId);exit;

}
}

additional field in payment section.that fields are for all payment method. js file

  define(
        [
            'ko',
            'jquery',
            'uiComponent'
        ],
        function (ko, $, Component) {
            'use strict';
            return Component.extend({
                defaults: {
                    template: 'Vendor_Module/checkout/formdata-form',
                    taxCode: '',
                    taxState: ''
                },
                initialize: function () {
                    this._super()
                            .observe(
                                    [   'taxCode',
                                        'taxState'
                                    ]
                                    );
                    return this;
                },
                getData: function () {
                    return {
                        "additional_data": {
                            'tax_code': this.taxCode(),
                            'tax_state': this.taxState()
                        }
                    };
                }
            });
        }
);

Answer 1

you can use sales_order_invoice_save_after(if you want to be sure the order is paid) or checkout_onepage_controller_success_action (after order success )

config.xml

<config xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="urn:magento:framework:Event/etc/events.xsd">
<event name="sales_order_invoice_save_after">
    <observer name="inteceptafterinvoice" instance="Mycomapny\Inventoryrationing\Observer\Afterinvoice" />
</event>

Afterinvoice.php

class Afterinvoice implements ObserverInterface {

       public function execute(Observer $observer) 
       {
          $_event = $observer->getEvent();
          $_invoice = $_event->getInvoice();
          $_order = $_invoice->getOrder();
          $addInfo= $_order->getPayment()->getAdditionalInformation();
          [...]
          // your To insert data in another table
          [...]
        }
    }

For more info refer to this link