How to add an Offers in Omniture Test and Target through APIs

Omniture Test and Target solution is quite a nice tool for you to manipulate different contents on the site. It is especially convince for non-IT users, to upload different contents, named "Offers" without knowing indepth programming knowledge. However when it comes to a large amount of "Offers", it becomes not easy to manage manually.
Recently, I found there is a nice offer options in TnT named "Widget Offer". The good things about it is that you can create the offers which is hosted outside Omniture, but directly calling the "Offer Creating API", which is kind of REst APIs.
The syntax actually is pretty simple. You can simply call the following URL and fill in the related parameters.The new offer will appear immediately after the success execution.

https://admin.testandtarget.omniture.com/api?client=clientcode&email=user@corp1.com&password=pword&operation=saveWidgetOffer

&name=WidgetOfferName&url=http%3A%2F%2Fwww.corp1.com%2Foffers%2FdynamicContent.php&id=999

Parameter	Description
client	(Required) The T&T client code.
email	(Required) The Email address associated with the T&T client.
password	(Required) The T&T client password.

Parameter	Description
operation	(Required) Identifies the type of T&T action to execute. To create a T&T campaign, this value is always saveWidgetOffer.
name	(Required) The name of the widget offer, which is displayed in the admin interface Offer list.
url	(Required)The encoded URL of the third-party server that hosts the dynamically generated response. T&T calls this URL and caches the resulting response.
id	(Required) The third-party ID of the widget offer.