NullPointerException when doGetTokenCall

[gaom25]

When I create a PayeezyClientHelper with a Properties object passed as argument I got a NullPointerException.
The exact error is:

• com.firstdata.payeezy.PayeezyClientHelper.doGetTokenCall(PayeezyClientHelper.java:102)

The code to create this object is:
Properties p = new Properties(); p.setProperty("url","https\\://api-cert.payeezy.com"); p.setProperty("apikey",api-key); p.setProperty("pzsecret",secret); p.setProperty("token",token); p.setProperty("proxyHost",""); p.setProperty("proxyPort",""); PayeezyClientHelper clientHelper = new PayeezyClientHelper(p);

I saw the documentation and it said the the required properties are, url, apikey, secret and token.
Thank you