code: public SendUsersMessageRequest withContext(java.util.Map<String, String> context) {
          setContext(context);
          return this;
      }
docs: A map of custom attribute-value pairs. Amazon Pinpoint adds these attributes to the data.pinpoint object in the
  body of the push notification payload. Amazon Pinpoint also provides these attributes in the events that it
  generates for users-messages deliveries.
  
  @param context
  A map of custom attribute-value pairs. Amazon Pinpoint adds these attributes to the data.pinpoint object
  in the body of the push notification payload. Amazon Pinpoint also provides these attributes in the events
  that it generates for users-messages deliveries.
  @return Returns a reference to this object so that method calls can be chained together.