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Processors Requiring Additional Transaction Parameters

American Express Additional Credit Card Parameters

118 07 January 2014 Gateway Developer Guide and Reference

MERCHANTCITY (Optional) The name of the city were the transaction took place.

 If you are a third-party biller (bill for services or goods rendered by another

entity), you must enter the name of the city in which the seller is located.

 If you are a mail order, phone order, or internet industry, you may substitute the

name of the city in which the merchant’s order processing facility is located.

Character length and limitations: 21 alphanumeric characters. If more than 21

characters, use proper and meaningful abbreviation. Do not truncate.

MERCHANTSTATE (Optional) The region code that corresponds to the state, province, or country

subdivision of the merchant location where the transaction took place.

Region code examples:

 CA = California, USA

 NS = Nova Scotia, Canada

 COS = Colima Mexico

If you are a third-party biller (bill for services or goods rendered by another entity),

you must enter the region code that corresponds to the state, province, or country

subdivision in which the seller is located.

Character length and limitations: 3 alphanumeric characters

MERCHANTZIP (Optional) The 5- to 9-digit zip (postal) code excluding spaces, dashes, and non-

numeric characters where the transaction took place.

If you are a third-party biller (bill for services or goods rendered by another entity),

you must enter the postal code that corresponds to the seller’s location.

Character length and limitations: 15 alphanumeric characters

MERCHANTCOUNTRYCODE (Optional) Country code of the location where the transaction took place. The

Payflow API accepts 3-digit numeric country codes. Refer to:

http://en.wikipedia.org/wiki/ISO_3166-1_numeric.

Character length and limitations: 3-character country code.

MERCHANTLOCATIONID (Optional)Merchant-assigned store or location number (or name) that uniquely

identifies where the transaction took place.

Character length and limitations: 15 alphanumeric characters

MERCHANTID (Required) American Express-assigned service establishment number used to identify

and facilitate payments to merchants.

Character length and limitations: 15 alphanumeric characters.

MERCHANTCONTACTINFO (Optional) Merchant’s telephone number or web address. (URLs and e-mail addresses

may be lowercase, as appropriate.) This entry may appear on the descriptive bill on

the card-member’s statement, or may be used to resolve billing inquiries and disputes.

NOTE: American Express strongly recommends that aggregators (third-parties who

bill for goods or services rendered by another entity) always fill in this field

with the URL, e-mail address, or telephone number of the contact responsible

for resolving disputes or inquiries.

Character length and limitations: 40 alphanumeric characters

Field Description

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