Here the list of available variables you can pass to Payment System 

To use any of this variable you need select 'Variable' in Parameter Type
and type variable name in Parameter Source.
 
Order and Shopping Cart Information
Variable Name  Variable Description 
 site_url Site URL 
 secure_url Secure Site URL 
 session_id PHP Session ID 
 user_ip Customer IP Address 
 order_id Order identificator / Invoice number 
 order_placed_date Date of placing order 
 user_id User unique identificator 
 currency_code Code for selected currency 
 currency_value ISO number value for selected currency 
 currency_rate Exchange rate for selected currency 
 total_quantity Total products quantity in user basket 
 total_buying Total buying amount for products in the basket 
 goods_total Total products amount in user basket 
 total_discount Total discount applied to order 
 shipping_cost Shipping cost 
 tax_percent Tax percent 
 tax_name Tax title 
 tax_cost Tax cost 
 processing_fee Processing Fee 
 order_total Total order amount 
 basket All shopping basket information in One 

 
Customer Information
Variable Name  Variable Description 
 name delivery_name User Name
 first_name delivery_first_name First Name
 last_name delivery_last_name Last Name
 company_name delivery_company_name Company Name
 email delivery_email Email
 address1 delivery_address1 Street Address
 First Line
 address2 delivery_address2 Street Address
 Second Line
 city delivery_city City
 province delivery_province Province
 state delivery_state State
 state_code delivery_state_code State Code
 zip delivery_zip Zip/Postal Code
 country delivery_country Country
 country_code delivery_country_code Country Code
 phone delivery_phone Phone
 daytime_phone delivery_daytime_phone Daytime Phone Number 
 evening_phone delivery_evening_phone  Evening Phone Number 
 cell_phone delivery_cell_phone Cell Phone Number
 fax delivery_fax Fax Number

 
Credit Card Information
Variable Name  Variable Description 
 cc_name Name of cardholder 
 cc_first_name First Name 
 cc_last_name Last Name 
 cc_number Card number 
 cc_number_last Four last digit of card number 
 cc_issue_number Issue number 
 cc_security_code Security code 
 cc_type Card type 
 cc_start_date Start Date  (MM/YYYY)
 cc_start_month Start Month  (MM)
 cc_start_year Start Year  (YY)
 cc_expiry_date Expiry Date  (MM/YYYY)
 cc_expiry_month Expiry Month  (MM)
 cc_expiry_year Expiry Year  (YY)
 pay_without_cc Payment information
 (if user choose do not pay by CC) 

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