Vendors network firewall rule on wbr blocks everything other than defined merchant APIs. We have three rules, PayPal, Square, and Others. Merchant networks are stored as firewall aliases.

PayPal - merchant_paypal:

64.4.240.0/21

64.4.248.0/22

66.211.168.0/22

173.0.80.0/20

173.0.88.0/21

paypalobjects.paypal.com

Square - merchant_square:

74.122.184.0/21

103.31.216.0/22

185.57.56.0/22

Others - merchant_others:

198.203.191.0/24 - Elavon

198.203.192.0/24 - Elavon

206.253.176.0/22 - Chase Paymenttech

65.124.118.0/24 - Chase Paymenttech

199.187.156.0/23 - Intuit

api.intuit.com - Intuit

-- JayH - 05 Jul 2016