Logging is PSR compatible

Context array is a map; instead of flat array.

0.3: Merge pull request #2 from roelvanduijnhoven/emit-response

• Correctly log response - See #2

0.2

Contains the following updates:

• Possibility to check PaymentSuccessType status of created payment. See #1
• Able to create recurring payments. See cda7e28

0.1

This is based on up-to-date code-base of the fork we used.