You know when a reply starts with ""Thank you"" that there's some good Sage stuff coming.
Via LinkedIn --
Thank you for your comments on Credit Card Processing with Sage 100 ERP. In order to clear any misconceptions I would like to state our policy and the reason for the decision, which affects all Sage ERP products.
Because of the increased complexity of PCI compliance and the associated risks for both Sage and our customers, Sage has decided to only offer Sage Payments and Sage Exchange as its PCI compliant payment processing solution. By storing credit card data in the Sage Exchange ""Vault"" instead of within the ERP application, we reduce the risk and simplify the process of obtaining PCI compliance. As a result of this policy, with Sage 100 ERP 2013 release, we are using Sage Payment Solutions exclusively, with credit card information stored in the Sage Exchange ""Vault"". Customers upgrading to this release have two choices if they are not already using Sage Payments:
1. Move their merchant account to Sage Payment for their processing. Customers can continue to maintain their relationship with their bank, but will need to go through the underwriting process with SPS. In most instances Sage Payments will match or even beat customer's current rates.
2. Alternatively, customers can continue processing credit cards with their current processor; however, credit card data cannot be integrated with Sage 100 ERP.
A number of processors and ISVs claim to have integrated to Sage 100 ERP or other Sage products. Customers and resellers should be aware that Sage either has de-authorized, or is in the process of de-authorizing, any Development Partner (ISV) that integrates payment functionality directly with Sage ERP products. Sage no longer allows third party integrations for payment processing due to the fact that we cannot control how the integration would adhere to PCI compliancy regulations. Development Partners have the option to integrate their solutions with Sage Payments -see
http://na.sage.com/sage-payment-solutions/developers/program-overview for details.
For more information on Sage Payments and PCI compliance, see
http://na.sage.com/erp/~/media/site/erp/lp/sps/index.html
For more information on Sage Exchange, see
http://na.sage.com/sage-payment-solutions/products-services/payment-consolidation-and-administration/
TL;DR:
Sage is not allowing any developers to create 3rd party links to payment processors other than Sage Payments or they will de-authorize the developer.