A Merchant Server Plug-in (MPI) is a software module or service that is integrated into a merchant’s website.
It can be integrated directly into the merchant website as a software component or it may be hosted by a service provider or an acquirer.
It provides the interface between the 3-D Secure program and the merchant payment processing software.
The J.P. Morgan solutions are based on a Merchant Plug-In for 3-D Secure that supports both the Verified by Visa and MasterCard® SecureCode™ schemes and is provided as an external service in conjunction with Orbital® Gateway.
The Service is only available to merchants domiciled in Europe.
The integration guide below provides an overview of the J.P. Morgan MPI solution, general integration, testing and usage instructions.
J.P. Morgan required to delete the integration guide
So I deleted it.
I would recommend to use a modern payment processor like Stripe instead