This parameter can be used to limit the cost of a message. It overrides the maximum charge associated with message delivery, as set by the routing profiles selected within your Developers' Central account.
A valid API message ID can still be returned for messages that are not delivered as a result of the maximum credit value set. These messages will have a status of routing error (009).
The credit value in this parameter can be set to any amount of credits.
You can view the Parameters list page to see the name of the parameter for the API you are using.