Get Invoice data by invoice id Magento 2.

You can get full details of Invoice related data using invoice id in Magento 2.

Using Magento\Sales\Api\InvoiceRepositoryInterface class you can get details of invoice related data in Magento 2.

Get Invoice related data using below code snippet in Magento 2 by Invoice id,

<?php
namespace Path\To\Class;

use Exception;
use Psr\Log\LoggerInterface;
use Magento\Sales\Api\Data\InvoiceInterface;
use Magento\Sales\Api\InvoiceRepositoryInterface;

class InvoiceData
{
    /**
     * @var InvoiceRepositoryInterface
     */
    private $invoiceRepository;

    /**
     * @var LoggerInterface
     */
    private $logger;

    public function __construct(
        InvoiceRepositoryInterface $invoiceRepository,
        LoggerInterface $logger
    ) {
        $this->invoiceRepository = $invoiceRepository;
        $this->logger = $logger;
    }

    /**
     * Get Invoice data
     *
     * @return InvoiceInterface|null
     */
    public function getInvoiceData(): ?InvoiceInterface
    {
        $invoiceId = 1;
        try {
            $invoiceData = $this->invoiceRepository->get($invoiceId);
        } catch (Exception $exception)  {
            $this->logger->critical($exception->getMessage());
            $invoiceData = null;
        }

        return $invoiceData;
    }
}

Pass Invoice id to fetch invoice records from a database table.
echo $invoice = $this->getInvoiceData();

Output:

Return Invoice object

Array
(
    [entity_id] => 1
    [store_id] => 2
    [base_grand_total] => 815.9800
    [shipping_tax_amount] => 0.0000
    [tax_amount] => 0.0000
    [base_tax_amount] => 0.0000
    [store_to_order_rate] => 0.0000
    [base_shipping_tax_amount] => 0.0000
    [base_discount_amount] => 0.0000
    [base_to_order_rate] => 1.0000
    [grand_total] => 815.9800
    [shipping_amount] => 15.9900
    [subtotal_incl_tax] => 799.9900
    [base_subtotal_incl_tax] => 799.9900
    [store_to_base_rate] => 0.0000
    [base_shipping_amount] => 15.9900
    [total_qty] => 1.0000
    [base_to_global_rate] => 1.0000
    [subtotal] => 799.9900
    [base_subtotal] => 799.9900
    [discount_amount] => 0.0000
    [billing_address_id] => 4
    [order_id] => 1
    [send_email] => 1
    [can_void_flag] => 0
    [state] => 2
    [shipping_address_id] => 3
    [store_currency_code] => USD
    [order_currency_code] => USD
    [base_currency_code] => USD
    [global_currency_code] => USD
    [increment_id] => 2000000001
    [created_at] => 2019-07-26 11:38:58
    [updated_at] => 2019-07-26 11:38:59
    [discount_tax_compensation_amount] => 0.0000
    [base_discount_tax_compensation_amount] => 0.0000
    [shipping_discount_tax_compensation_amount] => 0.0000
    [base_shipping_discount_tax_compensation_amnt] => 0.0000
    [shipping_incl_tax] => 15.9900
    [base_shipping_incl_tax] => 15.9900
)