added option to set a custom HTTP timeout (#79)

Author: shubhamk67

force-app/main/default/classes/AdyenClient.cls

@@ -38,6 +38,10 @@ public with sharing class AdyenClient {
         httpReq.setMethod('POST');
         httpReq.setHeader('X-API-KEY', config.getApiKey());
         httpReq.setHeader('Content-Type', 'application/json');
+        Integer timeout = config.getTimeout();
+        if (timeout != null) {
+            httpReq.setTimeout(timeout);
+        }
         httpReq.setBody(request);
         return httpReq;
     }

force-app/main/default/classes/AdyenConfig.cls

@@ -13,6 +13,7 @@ public with sharing class AdyenConfig {
     private String environment;
     private String endpoint;
     private String apiKey;
+    private Integer timeout;
 
     @namespaceAccessible
     public void setEnvironment(String environment){
@@ -38,4 +39,14 @@ public with sharing class AdyenConfig {
     public String getApiKey(){
         return this.apiKey;
     }
+
+    @namespaceAccessible
+    public void setTimeout(Integer timeout){
+        this.timeout = timeout;
+    }
+
+    @namespaceAccessible
+    public Integer getTimeout(){
+        return this.timeout;
+    }
 }