Can't let it work. Confusing translation

LiteCart Fan
Van Thailand
Lid sinds aug. 2017

Hello,
I just bought this Paypal module but I can't let it work.
Usually I place the API username, the API password and the signature in other carts/modules.
Here the translation ask strange things (I attached).
I try few combination but it does not work, the error is: Client Authentication failed
Please instruct me on how to use it. I am using version 2.2.2
Thank you, bye.
Vilaiporn

LiteCart Fan
Van Thailand
Lid sinds aug. 2017

I was too fast as usual.
I did create the REST API (I did not even think they exisit) and looks OK for now...

tim
Founder
Van Sweden
Lid sinds mei 2013
tim

Instructions in the README file :)

LiteCart Fan
Van Thailand
Lid sinds aug. 2017

yes...

LiteCart Fan
Van Italy
Lid sinds okt. 2018

ok sembra funzionare non per mettere le credenziali api ma qualcos'altro

tim
Founder
Van Sweden
Lid sinds mei 2013
tim

English please

U
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