diff --git a/src/main/java/net/authorize/api/controller/base/ApiOperationBase.java b/src/main/java/net/authorize/api/controller/base/ApiOperationBase.java
index 52e3d7cc..c59b2c55 100644
--- a/src/main/java/net/authorize/api/controller/base/ApiOperationBase.java
+++ b/src/main/java/net/authorize/api/controller/base/ApiOperationBase.java
@@ -121,12 +121,11 @@ public S executeWithApiResponse(Environment environment) {
 		return this.getApiResponse();
 	}
 
-	final String nullEnvironmentErrorMessage = "Environment not set. Set environment using setter or use overloaded method to pass appropriate environment";
 
 	public void execute() {
 		if ( null == ApiOperationBase.getEnvironment())
 		{
-			throw new InvalidParameterException(nullEnvironmentErrorMessage);
+			throw new InvalidParameterException(Constants.NULL_ENVIRONMENT_ERROR_MESSAGE);
 		} 
 		else
 		{
@@ -139,7 +138,7 @@ public void execute(Environment environment) {
 
 		logger.debug(String.format("Executing Request:'%s'", this.getApiRequest()));
 		
-		if ( null == environment) throw new InvalidParameterException(nullEnvironmentErrorMessage);
+		if ( null == environment) throw new InvalidParameterException(Constants.NULL_ENVIRONMENT_ERROR_MESSAGE);
 
 		ANetApiResponse httpApiResponse = HttpUtility.postData(environment, this.getApiRequest(), this.responseClass);
 		if ( null != httpApiResponse)
diff --git a/src/main/java/net/authorize/util/Constants.java b/src/main/java/net/authorize/util/Constants.java
index 2a2b42c5..af19aa91 100644
--- a/src/main/java/net/authorize/util/Constants.java
+++ b/src/main/java/net/authorize/util/Constants.java
@@ -36,4 +36,6 @@ public final class Constants {
 	public static final int HTTP_READ_TIME_OUT_DEFAULT_VALUE = 30000;
 	
 	public static final String CLIENT_ID = "sdk-java-2.0.3";
+	public static final String NULL_ENVIRONMENT_ERROR_MESSAGE = "Environment not set. Set environment using setter or use overloaded method to pass appropriate environment";
+
 }