Check started payments rarely.

started state is not good enough to use it as base to clone.

Do not play with mappings and just check existence of one.

Grab payments in confirmed and started state and analyse thier status against
payzen interface.

Start to use CRM in order to manage payments and its status with payzen.

getServicePassword returns '' if no password.
Fix typo in setter.

This comment ack as a simple documentation how to enable the upload
of the binary cache until appropriate documentation be provided.