Get invoice after payment paypal for merchant api php - php

Question

My problem is that I want to get a bill after paying for storage ( in .pdf) on the server. I've been looking at the API and create an invoice but know not how to get the bill automatically.
<?php
require __DIR__ . '/../bootstrap.php';
use PayPal\Api\Address;
use PayPal\Api\BillingInfo;
use PayPal\Api\Cost;
use PayPal\Api\Currency;
use PayPal\Api\Invoice;
use PayPal\Api\InvoiceAddress;
use PayPal\Api\InvoiceItem;
use PayPal\Api\MerchantInfo;
use PayPal\Api\PaymentTerm;
use PayPal\Api\Phone;
use PayPal\Api\ShippingInfo;
$invoice = new Invoice();
Invoice Info
$invoice
->setMerchantInfo(new MerchantInfo())
->setBillingInfo(array(new BillingInfo()))
->setNote("Medical Invoice 16 Jul, 2013 PST")
->setPaymentTerm(new PaymentTerm())
->setShippingInfo(new ShippingInfo());
Merchant Info
A resource representing merchant information that can be used to identify merchant
$invoice->getMerchantInfo()
->setEmail("jaypatel512-facilitator#hotmail.com")
->setFirstName("Dennis")
->setLastName("Doctor")
->setbusinessName("Medical Professionals, LLC")
->setPhone(new Phone())
->setAddress(new Address());
$invoice->getMerchantInfo()->getPhone()
->setCountryCode("001")
->setNationalNumber("5032141716");
Address Information
The address used for creating the invoice
$invoice->getMerchantInfo()->getAddress()
->setLine1("1234 Main St.")
->setCity("Portland")
->setState("OR")
->setPostalCode("97217")
->setCountryCode("US");
Billing Information
Set the email address for each billing
$billing = $invoice->getBillingInfo();
$billing[0]
->setEmail("example#example.com");
$billing[0]->setBusinessName("Jay Inc")
->setAdditionalInfo("This is the billing Info")
->setAddress(new InvoiceAddress());
$billing[0]->getAddress()
->setLine1("1234 Main St.")
->setCity("Portland")
->setState("OR")
->setPostalCode("97217")
->setCountryCode("US");
Items List
You could provide the list of all items for detailed breakdown of invoice
$items = array();
$items[0] = new InvoiceItem();
$items[0]
->setName("Sutures")
->setQuantity(100)
->setUnitPrice(new Currency());
$items[0]->getUnitPrice()
->setCurrency("USD")
->setValue(5);
Tax Item
You could provide Tax information to each item.
$tax = new \PayPal\Api\Tax();
$tax->setPercent(1)->setName("Local Tax on Sutures");
$items[0]->setTax($tax);
Second Item
$items[1] = new InvoiceItem();
Lets add some discount to this item.
$item1discount = new Cost();
$item1discount->setPercent("3");
$items[1]
->setName("Injection")
->setQuantity(5)
->setDiscount($item1discount)
->setUnitPrice(new Currency());
$items[1]->getUnitPrice()
->setCurrency("USD")
->setValue(5);
Tax Item
You could provide Tax information to each item.
$tax2 = new \PayPal\Api\Tax();
$tax2->setPercent(3)->setName("Local Tax on Injection");
$items[1]->setTax($tax2);
$invoice->setItems($items);
Final Discount
You can add final discount to the invoice as shown below. You could either use "percent" or "value" when providing the discount
$cost = new Cost();
$cost->setPercent("2");
$invoice->setDiscount($cost);
$invoice->getPaymentTerm()
->setTermType("NET_45");
Shipping Information
$invoice->getShippingInfo()
->setFirstName("Sally")
->setLastName("Patient")
->setBusinessName("Not applicable")
->setPhone(new Phone())
->setAddress(new InvoiceAddress());
$invoice->getShippingInfo()->getPhone()
->setCountryCode("001")
->setNationalNumber("5039871234");
$invoice->getShippingInfo()->getAddress()
->setLine1("1234 Main St.")
->setCity("Portland")
->setState("OR")
->setPostalCode("97217")
->setCountryCode("US");
Logo
You can set the logo in the invoice by providing the external URL pointing to a logo
$invoice->setLogoUrl('https://www.paypalobjects.com/webstatic/i/logo/rebrand/ppcom.svg');
For Sample Purposes Only.
$request = clone $invoice;
try {
Create Invoice
Create an invoice by calling the invoice->create() method with a valid ApiContext (See bootstrap.php for more on ApiContext)
$invoice->create($apiContext);
} catch (Exception $ex) {
NOTE: PLEASE DO NOT USE RESULTPRINTER CLASS IN YOUR ORIGINAL CODE. FOR SAMPLE ONLY
ResultPrinter::printError("Create Invoice", "Invoice", null, $request, $ex);
exit(1);
}
NOTE: PLEASE DO NOT USE RESULTPRINTER CLASS IN YOUR ORIGINAL CODE. FOR SAMPLE ONLY
ResultPrinter::printResult("Create Invoice", "Invoice", $invoice->getId(), $request, $invoice);
return $invoice;
if they could orient themselves, or some link which explains how to find it I would be grateful