The type of initial transaction.
Must match one of these available transaction types:
us_purchase
o us_purchase:recur
o us_purchase:avs_info
o us_purchase:avs_info:recur or us_purchase:recur:avs_info
us_preauth
o us_preauth:avs_info
- us_completion
- us_purchasecorrection
- us_refund
- us_ind_refund
Case sensitive field that must be all in lower case.