Add InitiatingSystemUserAgent

[aait]

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[codecov]

Codecov Report

Merging #45 (1d0eceb) into master (497edae) will increase coverage by 0.90%.
The diff coverage is 100.00%.

@@             Coverage Diff              @@
##             master      #45      +/-   ##
============================================
+ Coverage     41.84%   42.74%   +0.90%     
- Complexity     1278     1284       +6     
============================================
  Files           269      269              
  Lines          3016     3032      +16     
============================================
+ Hits           1262     1296      +34     
+ Misses         1754     1736      -18     

Impacted Files	Coverage Δ	Complexity Δ
...kPay/Api/Service/Payment/Resource/PaymentTrait.php	57.14% <100.00%> (+7.14%)	14.00 <2.00> (+2.00)
...y/Api/Service/Payment/Resource/Request/Payment.php	60.00% <100.00%> (+10.00%)	9.00 <1.00> (+1.00)
...ice/Paymentorder/Resource/Request/Paymentorder.php	65.47% <100.00%> (+27.31%)	41.00 <3.00> (+3.00)

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