Password Encrypt Type

halo,
what is the type of password below.?
and how to get past it in openbullet 2, thanks

password=cPy%2FRAGwedm6MqO%2BjGCW5WVZvh3mGDfK7h7d28OVuLd1QNElR5zIkb450VqZuQcyw%2BUkjxEJNIb5ztULPi8lIw%3D%3D

The password is URL encoded and the encryption is HMAC based
You have to get the encryption key so you can post it to OB2