Add support for explicit nullable 8.1+

Author: ayodejidev

src/Adyen/Config.php

@@ -34,7 +34,7 @@ class Config
      *
      * @param array|null $params
      */
-    public function __construct(array $params = null)
+    public function __construct(?array $params = null)
     {
         if ($params) {
             foreach ($params as $key => $param) {

templates/api-single.mustache

@@ -52,7 +52,7 @@ class {{customApi}}Api extends Service
     {{#returnType}}* @return {{returnType}}{{/returnType}}
     * @throws AdyenException
     */
-    public function {{#lambda.camelcase}}{{vendorExtensions.x-methodName}}{{/lambda.camelcase}}({{>api_parameters}}){{#returnType}}: {{{.}}}{{/returnType}}
+    public function {{#lambda.camelcase}}{{vendorExtensions.x-methodName}}{{/lambda.camelcase}}({{>api_parameters}}){{#returnType}}: ?{{{.}}}{{/returnType}}
     {
         $endpoint = $this->baseURL . {{#hasPathParams}}str_replace([{{#pathParams}}'{{>left_bracket}}{{baseName}}{{>right_bracket}}'{{^-last}}, {{/-last}}{{/pathParams}}], [{{#pathParams}}${{baseName}}{{^-last}}, {{/-last}}{{/pathParams}}], {{/hasPathParams}}"{{{path}}}"{{#hasPathParams}}){{/hasPathParams}};
         {{#returnType}}$response = {{/returnType}}$this->requestHttp($endpoint, strtolower('{{httpMethod}}'), {{#bodyParam}}(array) ${{#lambda.camelcase}}{{paramName}}{{/lambda.camelcase}}->jsonSerialize(){{/bodyParam}}{{^bodyParam}}null{{/bodyParam}}, $requestOptions);

templates/api.mustache

@@ -53,7 +53,7 @@ class {{classname}} extends Service
     {{#returnType}}* @return {{returnType}}{{/returnType}}
     * @throws AdyenException
     */
-    public function {{#lambda.camelcase}}{{vendorExtensions.x-methodName}}{{/lambda.camelcase}}({{>api_parameters}}){{#returnType}}: {{{.}}}{{/returnType}}
+    public function {{#lambda.camelcase}}{{vendorExtensions.x-methodName}}{{/lambda.camelcase}}({{>api_parameters}}){{#returnType}}: ?{{{.}}}{{/returnType}}
     {
         $endpoint = $this->baseURL . {{#hasPathParams}}str_replace([{{#pathParams}}'{{>left_bracket}}{{baseName}}{{>right_bracket}}'{{^-last}}, {{/-last}}{{/pathParams}}], [{{#pathParams}}${{baseName}}{{^-last}}, {{/-last}}{{/pathParams}}], {{/hasPathParams}}"{{{path}}}"{{#hasPathParams}}){{/hasPathParams}};
         {{#returnType}}$response = {{/returnType}}$this->requestHttp($endpoint, strtolower('{{httpMethod}}'), {{#bodyParam}}(array) ${{#lambda.camelcase}}{{paramName}}{{/lambda.camelcase}}->jsonSerialize(){{/bodyParam}}{{^bodyParam}}null{{/bodyParam}}, $requestOptions);

templates/model_generic.mustache

@@ -236,10 +236,10 @@ class {{classname}} {{#parentSchema}}extends {{{parent}}}{{/parentSchema}}{{^par
     /**
      * Constructor
      *
-     * @param mixed[] $data Associated array of property values
+     * @param mixed[]|null $data Associated array of property values
      *                      initializing the model
      */
-    public function __construct(array $data = null)
+    public function __construct(?array $data = null)
     {
         {{#parentSchema}}
         parent::__construct($data);