invoiceninja/app/Http/Controllers/PaymentApiController.php

<?php namespace App\Http\Controllers;

use Input;
use Utils;
use Response;
use App\Models\Payment;
use App\Models\Invoice;
use App\Ninja\Repositories\PaymentRepository;

class PaymentApiController extends Controller
{
    protected $paymentRepo;

    public function __construct(PaymentRepository $paymentRepo)
    {
        $this->paymentRepo = $paymentRepo;
    }

    public function index()
    {
        $payments = Payment::scope()
                        ->with('client', 'contact', 'invitation', 'user', 'invoice')
                        ->orderBy('created_at', 'desc')
                        ->get();
        $payments = Utils::remapPublicIds($payments);
        
        $response = json_encode($payments, JSON_PRETTY_PRINT);
        $headers = Utils::getApiHeaders(count($payments));

        return Response::make($response, 200, $headers);
    }


    public function store()
    {
        $data = Input::all();
        $error = false;

        if (isset($data['invoice_id'])) {
            $invoice = Invoice::scope($data['invoice_id'])->with('client')->first();

            if ($invoice) {
                $data['invoice'] = $invoice->public_id;
                $data['client'] = $invoice->client->public_id;
            } else {
                $error = trans('validation.not_in', ['attribute' => 'invoice_id']);
            }
        } else {
            $error = trans('validation.not_in', ['attribute' => 'invoice_id']);
        }

        if (!isset($data['transaction_reference'])) {
            $data['transaction_reference'] = '';
        }

        if (!$error) {
            $payment = $this->paymentRepo->save(false, $data);
            $payment = Payment::scope($payment->public_id)->with('client', 'contact', 'user', 'invoice')->first();

            $payment = Utils::remapPublicIds([$payment]);
        }

        $response = json_encode($error ?: $payment, JSON_PRETTY_PRINT);
        $headers = Utils::getApiHeaders();
        return Response::make($response, 200, $headers);
    }
}