Yes, the interchange fees are included.
Yes. Global Payments Integration will send you a monthly statement for processing the prior month.
Chargebacks show on the merchant's statements. The merchant will need to speak with Global Payments’ customer service to investigate further and get it resolved.
As long as Amex is under $1 million annually, it is included in the same statement and rates as the other card brands.
We all have our own responsibility to be PCI compliant. The merchant would still need to be PCI compliant.
No, RCM only works with Windows or MacOS (OS X). See system requirements. Note, you can use OpenEdge Mobile which is available through the Apple Store. However, there is no integration between Pay and OpenEdge Mobile and is 100% completely separate. Any transactions performed through OpenEdge Mobile will not be supported by CivicPlus.
This information is documented at Information Regarding OpenEdge's IP Ranges and Ports Now Online. Please see the section under "Payment System Applications"