When I have a lot of parameters in a single step I use a table parameter with the transformer=FROM_LANDSCAPE option, like this:
{transformer=FROM_LANDSCAPE}
|amount |100|
|type |Visa|
|name |card-holder-name|
|number |1234567890123456|
|verification code|000|
|expiry month |09|
|expiry year |14|
http://jbehave.org/reference/stable/tabular-parameters.html
Another way is to set all your parameters before with the @Given annotation