Adyen

106 add /costEstimate endpoint
102 fix HMAC signature calculation
105 various fixes

94 [PW-1184] Add codeowers file for GitHub, remove validation and fixing failed te…
91 [PW-1701] Added the xapikey in http client request for call api
89 Fix coverage command
88 App name can be empty
87 Xapi key for recurring
84 [PW-1636] Fix travis build and hmac tests
80 Install wheel needed for pycurl
79 [PW-1595] Add HMAC validation on all libraries. Add method to validate hmac
78 Mutable types used as defaults

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