diff --git a/lib/ApiOperations/NestedResource.php b/lib/ApiOperations/NestedResource.php
index 180cacd2cc..26af8dc307 100644
--- a/lib/ApiOperations/NestedResource.php
+++ b/lib/ApiOperations/NestedResource.php
@@ -10,7 +10,7 @@
 trait NestedResource
 {
     /**
-     * @param string $method
+     * @param 'delete'|'get'|'post' $method
      * @param string $url
      * @param null|array $params
      * @param null|array|string $options
diff --git a/lib/ApiOperations/Request.php b/lib/ApiOperations/Request.php
index a60ca796a0..12df3f2b7f 100644
--- a/lib/ApiOperations/Request.php
+++ b/lib/ApiOperations/Request.php
@@ -27,7 +27,7 @@ protected static function _validateParams($params = null)
     }
 
     /**
-     * @param string $method HTTP method ('get', 'post', etc.)
+     * @param 'delete'|'get'|'post' $method HTTP method ('get', 'post', etc.)
      * @param string $url URL for the request
      * @param array $params list of parameters for the request
      * @param null|array|string $options
@@ -46,7 +46,7 @@ protected function _request($method, $url, $params = [], $options = null)
     }
 
     /**
-     * @param string $method HTTP method ('get', 'post', etc.)
+     * @param 'delete'|'get'|'post' $method HTTP method ('get', 'post', etc.)
      * @param string $url URL for the request
      * @param callable $readBodyChunk function that will receive chunks of data from a successful request body
      * @param array $params list of parameters for the request
@@ -61,7 +61,7 @@ protected function _requestStream($method, $url, $readBodyChunk, $params = [], $
     }
 
     /**
-     * @param string $method HTTP method ('get', 'post', etc.)
+     * @param 'delete'|'get'|'post' $method HTTP method ('get', 'post', etc.)
      * @param string $url URL for the request
      * @param array $params list of parameters for the request
      * @param null|array|string $options
@@ -82,7 +82,7 @@ protected static function _staticRequest($method, $url, $params, $options)
     }
 
     /**
-     * @param string $method HTTP method ('get', 'post', etc.)
+     * @param 'delete'|'get'|'post' $method HTTP method ('get', 'post', etc.)
      * @param string $url URL for the request
      * @param callable $readBodyChunk function that will receive chunks of data from a successful request body
      * @param array $params list of parameters for the request
diff --git a/lib/ApiRequestor.php b/lib/ApiRequestor.php
index 7162e33b53..89b5bee85d 100644
--- a/lib/ApiRequestor.php
+++ b/lib/ApiRequestor.php
@@ -106,7 +106,7 @@ private static function _encodeObjects($d)
     }
 
     /**
-     * @param string     $method
+     * @param 'delete'|'get'|'post' $method
      * @param string     $url
      * @param null|array $params
      * @param null|array $headers
@@ -128,7 +128,7 @@ public function request($method, $url, $params = null, $headers = null)
     }
 
     /**
-     * @param string     $method
+     * @param 'delete'|'get'|'post' $method
      * @param string     $url
      * @param callable $readBodyChunkCallable
      * @param null|array $params
@@ -432,7 +432,7 @@ function ($key) use ($params) {
     }
 
     /**
-     * @param string $method
+     * @param 'delete'|'get'|'post' $method
      * @param string $url
      * @param array $params
      * @param array $headers
@@ -469,7 +469,7 @@ private function _requestRaw($method, $url, $params, $headers)
     }
 
     /**
-     * @param string $method
+     * @param 'delete'|'get'|'post' $method
      * @param string $url
      * @param array $params
      * @param array $headers
diff --git a/lib/BaseStripeClient.php b/lib/BaseStripeClient.php
index b0b2e7e57b..a2c1d30d87 100644
--- a/lib/BaseStripeClient.php
+++ b/lib/BaseStripeClient.php
@@ -119,7 +119,7 @@ public function getFilesBase()
     /**
      * Sends a request to Stripe's API.
      *
-     * @param string $method the HTTP method
+     * @param 'delete'|'get'|'post' $method the HTTP method
      * @param string $path the path of the request
      * @param array $params the parameters of the request
      * @param array|\Stripe\Util\RequestOptions $opts the special modifiers of the request
@@ -143,7 +143,7 @@ public function request($method, $path, $params, $opts)
      * Sends a request to Stripe's API, passing chunks of the streamed response
      * into a user-provided $readBodyChunkCallable callback.
      *
-     * @param string $method the HTTP method
+     * @param 'delete'|'get'|'post' $method the HTTP method
      * @param string $path the path of the request
      * @param callable $readBodyChunkCallable a function that will be called
      * @param array $params the parameters of the request
@@ -161,7 +161,7 @@ public function requestStream($method, $path, $readBodyChunkCallable, $params, $
     /**
      * Sends a request to Stripe's API.
      *
-     * @param string $method the HTTP method
+     * @param 'delete'|'get'|'post' $method the HTTP method
      * @param string $path the path of the request
      * @param array $params the parameters of the request
      * @param array|\Stripe\Util\RequestOptions $opts the special modifiers of the request
@@ -185,7 +185,7 @@ public function requestCollection($method, $path, $params, $opts)
     /**
      * Sends a request to Stripe's API.
      *
-     * @param string $method the HTTP method
+     * @param 'delete'|'get'|'post' $method the HTTP method
      * @param string $path the path of the request
      * @param array $params the parameters of the request
      * @param array|\Stripe\Util\RequestOptions $opts the special modifiers of the request
diff --git a/lib/HttpClient/ClientInterface.php b/lib/HttpClient/ClientInterface.php
index 3c7861e597..6d17eb8ae3 100644
--- a/lib/HttpClient/ClientInterface.php
+++ b/lib/HttpClient/ClientInterface.php
@@ -5,7 +5,7 @@
 interface ClientInterface
 {
     /**
-     * @param string $method The HTTP method being used
+     * @param 'delete'|'get'|'post' $method The HTTP method being used
      * @param string $absUrl The URL being requested, including domain and protocol
      * @param array $headers Headers to be used in the request (full strings, not KV pairs)
      * @param array $params KV pairs for parameters. Can be nested for arrays and hashes
diff --git a/lib/HttpClient/StreamingClientInterface.php b/lib/HttpClient/StreamingClientInterface.php
index 482f9a1199..7612c94a6c 100644
--- a/lib/HttpClient/StreamingClientInterface.php
+++ b/lib/HttpClient/StreamingClientInterface.php
@@ -5,7 +5,7 @@
 interface StreamingClientInterface
 {
     /**
-     * @param string $method The HTTP method being used
+     * @param 'delete'|'get'|'post' $method The HTTP method being used
      * @param string $absUrl The URL being requested, including domain and protocol
      * @param array $headers Headers to be used in the request (full strings, not KV pairs)
      * @param array $params KV pairs for parameters. Can be nested for arrays and hashes
diff --git a/lib/Service/OAuthService.php b/lib/Service/OAuthService.php
index b745ad9876..3870cccd48 100644
--- a/lib/Service/OAuthService.php
+++ b/lib/Service/OAuthService.php
@@ -7,7 +7,7 @@ class OAuthService extends \Stripe\Service\AbstractService
     /**
      * Sends a request to Stripe's Connect API.
      *
-     * @param string $method the HTTP method
+     * @param 'delete'|'get'|'post' $method the HTTP method
      * @param string $path the path of the request
      * @param array $params the parameters of the request
      * @param array|\Stripe\Util\RequestOptions $opts the special modifiers of the request
diff --git a/lib/StripeClientInterface.php b/lib/StripeClientInterface.php
index d5a8806ff5..a18308d720 100644
--- a/lib/StripeClientInterface.php
+++ b/lib/StripeClientInterface.php
@@ -10,7 +10,7 @@ interface StripeClientInterface extends BaseStripeClientInterface
     /**
      * Sends a request to Stripe's API.
      *
-     * @param string $method the HTTP method
+     * @param 'delete'|'get'|'post' $method the HTTP method
      * @param string $path the path of the request
      * @param array $params the parameters of the request
      * @param array|\Stripe\Util\RequestOptions $opts the special modifiers of the request
diff --git a/phpstan.neon.dist b/phpstan.neon.dist
index fb066c682f..983b38e605 100644
--- a/phpstan.neon.dist
+++ b/phpstan.neon.dist
@@ -2,7 +2,7 @@ includes:
 	- phpstan-baseline.neon
 
 parameters:
-	level: 1
+	level: 2
 
 	bootstrapFiles:
 		- tests/bootstrap.php
diff --git a/tests/Stripe/BaseStripeClientTest.php b/tests/Stripe/BaseStripeClientTest.php
index 561af37d0f..775d55b664 100644
--- a/tests/Stripe/BaseStripeClientTest.php
+++ b/tests/Stripe/BaseStripeClientTest.php
@@ -202,4 +202,133 @@ public function testRequestWithOptsInParamsWarns()
         static::assertNotNull($charge);
         static::assertSame('acct_456', $this->optsReflector->getValue($charge)->headers['Stripe-Account']);
     }
+
+    public function testJsonRawRequestGetWithURLParams()
+    {
+        $curlClientStub = $this->getMockBuilder(\Stripe\HttpClient\CurlClient::class)
+            ->onlyMethods(['executeRequestWithRetries'])
+            ->getMock()
+        ;
+        $curlClientStub->method('executeRequestWithRetries')
+            ->willReturn(['{}', 200, []])
+        ;
+
+        $opts = null;
+        $curlClientStub->expects(static::once())
+            ->method('executeRequestWithRetries')
+            ->with(static::callback(function ($opts_) use (&$opts) {
+                $opts = $opts_;
+
+                return true;
+            }), MOCK_URL . '/v1/xyz?foo=bar')
+        ;
+
+        ApiRequestor::setHttpClient($curlClientStub);
+        $client = new BaseStripeClient([
+            'api_key' => 'sk_test_client',
+            'stripe_account' => 'acct_123',
+            'api_base' => MOCK_URL,
+        ]);
+        $client->rawRequest('get', '/v1/xyz?foo=bar', null, []);
+        static::assertArrayNotHasKey(\CURLOPT_POST, $opts);
+        static::assertArrayNotHasKey(\CURLOPT_POSTFIELDS, $opts);
+        $content_type = null;
+        foreach ($opts[\CURLOPT_HTTPHEADER] as $header) {
+            if (\str_starts_with($header, 'Content-Type:')) {
+                $content_type = $header;
+            }
+        }
+        // The library sends Content-Type even with no body, so assert this
+        // But it would be more correct to not send Content-Type
+        static::assertStringStartsWith('Content-Type: application/x-www-form-urlencoded', $content_type);
+    }
+
+    public function testJsonRawRequestPost()
+    {
+        $curlClientStub = $this->getMockBuilder(\Stripe\HttpClient\CurlClient::class)
+            ->onlyMethods(['executeRequestWithRetries'])
+            ->getMock()
+        ;
+        $curlClientStub->method('executeRequestWithRetries')
+            ->willReturn(['{"object": "xyz", "isPHPBestLanguage": true, "abc": {"object": "abc", "a": 2}}', 200, []])
+        ;
+
+        $curlClientStub->expects(static::once())
+            ->method('executeRequestWithRetries')
+            ->with(static::callback(function ($opts) {
+                $this->assertSame(1, $opts[\CURLOPT_POST]);
+                $this->assertSame('{"foo":"bar","baz":{"qux":false}}', $opts[\CURLOPT_POSTFIELDS]);
+                $this->assertContains('Content-Type: application/json', $opts[\CURLOPT_HTTPHEADER]);
+
+                return true;
+            }), MOCK_URL . '/v1/xyz')
+        ;
+
+        ApiRequestor::setHttpClient($curlClientStub);
+        $client = new BaseStripeClient([
+            'api_key' => 'sk_test_client',
+            'stripe_account' => 'acct_123',
+            'api_base' => MOCK_URL,
+        ]);
+        $params = ['foo' => 'bar', 'baz' => ['qux' => false]];
+        $resp = $client->rawRequest('post', '/v1/xyz', $params, [
+            'encoding' => 'json',
+        ]);
+
+        $decoded = \json_decode($resp->body, true);
+        $xyz = \Stripe\StripeObject::constructFrom($decoded);
+
+        static::assertSame('xyz', $xyz->object);
+        static::assertTrue($xyz->isPHPBestLanguage);
+        static::assertSame(2, $xyz->abc->a);
+        static::assertInstanceof(\Stripe\StripeObject::class, $xyz->abc);
+    }
+
+    public function testFormRawRequestPost()
+    {
+        $curlClientStub = $this->getMockBuilder(\Stripe\HttpClient\CurlClient::class)
+            ->onlyMethods(['executeRequestWithRetries'])
+            ->getMock()
+        ;
+        $curlClientStub->method('executeRequestWithRetries')
+            ->willReturn(['{}', 200, []])
+        ;
+
+        $curlClientStub->expects(static::once())
+            ->method('executeRequestWithRetries')
+            ->with(static::callback(function ($opts) {
+                $this->assertSame(1, $opts[\CURLOPT_POST]);
+                $this->assertSame('foo=bar&baz[qux]=false', $opts[\CURLOPT_POSTFIELDS]);
+                $this->assertContains('Content-Type: application/x-www-form-urlencoded', $opts[\CURLOPT_HTTPHEADER]);
+
+                return true;
+            }), MOCK_URL . '/v1/xyz')
+        ;
+
+        ApiRequestor::setHttpClient($curlClientStub);
+        $client = new BaseStripeClient([
+            'api_key' => 'sk_test_client',
+            'stripe_account' => 'acct_123',
+            'api_base' => MOCK_URL,
+        ]);
+        $params = ['foo' => 'bar', 'baz' => ['qux' => false]];
+        $client->rawRequest('post', '/v1/xyz', $params, [
+            'encoding' => 'form',
+        ]);
+    }
+
+    public function testJsonRawRequestGetWithNonNullParams()
+    {
+        $client = new BaseStripeClient([
+            'api_key' => 'sk_test_client',
+            'stripe_account' => 'acct_123',
+            'api_base' => MOCK_URL,
+        ]);
+        $params = [];
+        $this->expectException(\Stripe\Exception\InvalidArgumentException::class);
+        $this->expectExceptionMessage('Error: rawRequest only supports $params on post requests. Please pass null and add your parameters to $path');
+        $client->rawRequest('get', '/v1/xyz', $params, [
+            'encoding' => 'json',
+        ]);
+    }
 }
diff --git a/tests/TestHelper.php b/tests/TestHelper.php
index 350608f2d4..95e4ec64bc 100644
--- a/tests/TestHelper.php
+++ b/tests/TestHelper.php
@@ -71,7 +71,7 @@ protected function tearDownConfig()
      * Sets up a request expectation with the provided parameters. The request
      * will actually go through and be emitted.
      *
-     * @param string $method HTTP method (e.g. 'post', 'get', etc.)
+     * @param 'delete'|'get'|'post' $method HTTP method (e.g. 'post', 'get', etc.)
      * @param string $path relative path (e.g. '/v1/charges')
      * @param null|array $params array of parameters. If null, parameters will
      *   not be checked.
@@ -106,7 +106,7 @@ function ($method, $absUrl, $headers, $params, $hasFile) {
      * Sets up a request expectation with the provided parameters. The request
      * will actually go through and be emitted.
      *
-     * @param string $method HTTP method (e.g. 'post', 'get', etc.)
+     * @param 'delete'|'get'|'post' $method HTTP method (e.g. 'post', 'get', etc.)
      * @param string $path relative path (e.g. '/v1/charges')
      * @param null|array $params array of parameters. If null, parameters will
      *   not be checked.
@@ -142,7 +142,7 @@ function ($method, $absUrl, $readBodyChunkCallable, $headers, $params, $hasFile)
      * will not actually be emitted, instead the provided response parameters
      * will be returned.
      *
-     * @param string $method HTTP method (e.g. 'post', 'get', etc.)
+     * @param 'delete'|'get'|'post' $method HTTP method (e.g. 'post', 'get', etc.)
      * @param string $path relative path (e.g. '/v1/charges')
      * @param null|array $params array of parameters. If null, parameters will
      *   not be checked.
@@ -175,7 +175,7 @@ protected function stubRequest(
      * prepare the client mocker to expect an invocation of the `request` method
      * with the provided arguments.
      *
-     * @param string $method HTTP method (e.g. 'post', 'get', etc.)
+     * @param 'delete'|'get'|'post' $method HTTP method (e.g. 'post', 'get', etc.)
      * @param string $path relative path (e.g. '/v1/charges')
      * @param null|array $params array of parameters. If null, parameters will
      *   not be checked.
@@ -231,7 +231,7 @@ private function prepareRequestMock(
      * prepare the client mocker to expect an invocation of the `request` method
      * with the provided arguments.
      *
-     * @param string $method HTTP method (e.g. 'post', 'get', etc.)
+     * @param 'delete'|'get'|'post' $method HTTP method (e.g. 'post', 'get', etc.)
      * @param string $path relative path (e.g. '/v1/charges')
      * @param null|array $params array of parameters. If null, parameters will
      *   not be checked.