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N O T E:
ITEMS IN Bold are required.
All others are Conditional or Optional based on your use and need.

Here is the Full API List for the Payment Interface:

Field Name	Max Size	Attribute	Notes
merchantID	19	N	Required - Unique ID assigned by EdgePay**
terminalID	19	N	Required - Unique ID also assigned by EdgePay
sID	15	N	Required for PayFac - Unique ID also assigned by EdgePay
cardNumber	19	N	Conditional - Supply this if card entered manually
cardExpirationDate	4	N	Conditional - Provide if cardNumber is used (MMYY)
trackData	39	AN	Conditional - Track1 or Track2 unencrypted Swipe or EMV
tokenID	16	N	Conditional - May supply in place of trackData or cardNumber from previous request
token	3	yes	For the Tokenization Services the API allows you to request a token, (replacement value), for both credit cards or bank accounts that you can store for future payment uses.
paymentDataInput	14	AN	Required - Defines the point of sale card enter mode: Phone Mail Internet Swipe
amount	12	N	Required - Total amount to charge with or without decimal. All minor units after decimal. No decimal amount is processed as major units (dollars, euros, etc.)
acctSplits		Array	Settlement Split Account and amount that funds will be settled to
currencyCode	3	N	Optional = Assumes USD unless otherwise specified
customerName	30	ANS	Conditional - Required for eCheck. Optional for all other transactions. Allowable Special Characters & /. ( ) - , ''
customerNumber	17	AN	Conditional – Customer Order Number, see below for use. Required for Recurring Payment Customer
processor	10	AN	Future use
billingAddress	200	AN	Conditional - Not required but may improve interchange rate for phone, mail, internet, or manual entry. Allowable Special Characters # . , ; : ''' °
billingCity	50	AN	same as billingAddress Allowable Special Characters - , . ; ''' & / . ( )
billingState	2	A	same as billing Address
billingZip	10	AN	Required - same as billing Address "-" Allowed
cvv2	4	N	Optional - Security code from Card
merchantField1	200	AN	Optional - Reporting
merchantField2	200	AN	Optional - Reporting
posData			Optional description for eCheck
goodsOrServices	10	AN	Optional Description
memberUsername	60	AN	Optional - Recurring Payment Manager Customer
memberPassword	60	AN	Optional - Recurring Payment Manager Customer
siteUrl	100	AN	Optional - Recurring Payment Manager Customer
affiliate	12	ANS	Optional - Recurring Payment Manager Customer
cardholderIPAddress	39	ANS	Optional – Enhanced Fraud Management Service IPv6 supported
eMailAddress	128	ANS	Customer’s email address
softDescriptor	25	AN	Text that will appear on the cardholder's statement that describes the purchase.