Added Credit Note Support

src/Resources/CreditNotes.php

@@ -0,0 +1,53 @@
+<?php
+
+namespace Dcblogdev\Xero\Resources;
+
+use Dcblogdev\Xero\Enums\FilterOptions;
+use Dcblogdev\Xero\Xero;
+use InvalidArgumentException;
+
+class CreditNotes extends Xero
+{
+    protected array $queryString = [];
+
+    public function filter($key, $value): static
+    {
+        if (! FilterOptions::isValid($key)) {
+            throw new InvalidArgumentException("Filter option '$key' is not valid.");
+        }
+
+        $this->queryString[$key] = $value;
+
+        return $this;
+    }
+
+    public function get(): array
+    {
+        $queryString = $this->formatQueryStrings($this->queryString);
+
+        $result = parent::get('CreditNotes?'.$queryString);
+
+        return $result['body']['CreditNotes'];
+    }
+
+    public function find(string $contactId): array
+    {
+        $result = parent::get('CreditNotes/'.$contactId);
+
+        return $result['body']['CreditNotes'][0];
+    }
+
+    public function update(string $contactId, array $data): array
+    {
+        $result = $this->post('CreditNotes/'.$contactId, $data);
+
+        return $result['body']['CreditNotes'][0];
+    }
+
+    public function store(array $data): array
+    {
+        $result = $this->post('CreditNotes', $data);
+
+        return $result['body']['CreditNotes'][0];
+    }
+}

src/Xero.php

@@ -4,6 +4,7 @@
 
 use Dcblogdev\Xero\Models\XeroToken;
 use Dcblogdev\Xero\Resources\Contacts;
+use Dcblogdev\Xero\Resources\CreditNotes;
 use Dcblogdev\Xero\Resources\Invoices;
 use Dcblogdev\Xero\Resources\Webhooks;
 use Exception;
@@ -42,6 +43,11 @@ public function contacts(): Contacts
         return new Contacts();
     }
 
+    public function creditnotes(): CreditNotes
+    {
+        return new CreditNotes();
+    }
+
     public function invoices(): Invoices
     {
         return new Invoices();

tests/Resources/CreditNotesTest.php

@@ -0,0 +1,17 @@
+<?php
+
+use Dcblogdev\Xero\Facades\Xero;
+use Dcblogdev\Xero\Resources\CreditNotes;
+
+test('invalid filter option throws exception', function(){
+   Xero::creditnotes()
+       ->filter('bogus', 1)
+       ->get();
+})->throws(InvalidArgumentException::class, "Filter option 'bogus' is not valid.");
+
+test('filter returns object', function(){
+
+    $filter = (new CreditNotes())->filter('ids', '1234');
+
+    expect($filter)->toBeObject();
+});