Adyen

74 Fix payout tests
73 Update api and checkout version to v49
68 HttpClient interface
67 App_name default of none crashes user agent

Features:
58 Add application info
60 Update checkout version v41

Adyen Python API Library 1.4.0 supports checkout api v40

Features:
42 Add support for Third Party Payout service

Fixes:
39 Fixed issue when raw_response is empty.
40 Added GitHub templates for issues and PRs
41 PW-279: Refactor code to PEP8 standards
45 Move constants to settings file and raise error on KeyError
46 code optimizations
50 deleted unused, rephrased names

37 Use a different version for Recurring API (v25)
34 Updated endpoints to latest version (v30)

* 16 Python 3 compatibility
* 23 Created test cases with coveralls support, added http_force mechanism for forcing a specific library for the http requests