Android Question Agentine Payment Lib help

Hi, how can I use this payment method in b4a?
Its java related and I dont know how to add it in b4a.
The download page is:

https://ar.dineromail.com/desarrolladores/biblioteca

(desarrolladores = developers , biblioteca = library)

this is the download link:
https://ar.dineromail.com/content/SDKMobile.zip

Inside the zip there are an english pdf

Please help,
Thanks