Did anyone manage to get this going? I also want to automatically send the amount due to Ingenico payment terminal so no need to retype the amount.

connecting and running  payment terminals on POSBox in different countries is heavily underdocumented.

this is what i know:

to connect a payment terminal you need three things:
1.
hardware: POSBox  and payment terminal.
if POSBox has no free USBs port for the payment terminal you need serial connector cable. (this problem is not 100% clear).

2.
additional module on server:

 "On the main Odoo server, you should install the module pos_payment_terminal."

https://www.odoo.com/apps/modules/10.0/pos_payment_terminal/

this module talks to the POSBox that it shall communicate with payment terminal.

3.
additional module on POSBox:

On the POSBox you may install a module with the right protocol for your payment terminal IN YOUR COUNTRY!


"On the POSbox, you should install the module hw_x depending on the protocol implemented in your device."

for France, the Telium protocol seems to be running. you can use module hw_telium_payment_terminal :
https://www.odoo.com/apps/modules/8.0/hw_telium_payment_terminal/

(it is not sure whether that works on 9.0 or 10.0)

if you have other than Telium protocol (e.g. ZVT, OSI in germany) then you must ask for a module that supports that.

i have not found any other module than Telium.

--
hint: call the biggest odoo gold partner in your country and ask them directly (and provide answer here).