How to integrate yandex money into an Android application?

Question

Java

I'm trying to integrate payment through the POISON into my application. To do this, I downloaded the library and the sample . When trying to send money from card to card, it gives null pointer here

startPaymentActivityForResult(new P2pTransferParams.Builder(getPaymentTo())
                            .setAmount(getAmount())
                            .build());

When you try to transfer money to your mobile, it says that the payment failed and asks you to try again.
There are people who have successfully integrated this library into their application. Please help. Thanks