feat(server): allow pass coupon to checkout session

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Current dependencies on/for this PR:

• canary
  • PR feat(server): allow pass coupon to checkout session #5749 👈

This stack of pull requests is managed by Graphite.

[codecov]

Codecov Report

Attention: 83 lines in your changes are missing coverage. Please review.

Comparison is base (5f3c04b) 64.47% compared to head (87c844e) 64.29%.
Report is 1 commits behind head on canary.

Files	Patch %	Lines
...ages/backend/server/src/plugins/payment/service.ts	3.44%	56 Missing ⚠️
...ges/backend/server/src/plugins/payment/resolver.ts	55.73%	27 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           canary    #5749      +/-   ##
==========================================
- Coverage   64.47%   64.29%   -0.18%     
==========================================
  Files         339      339              
  Lines       19239    19355     +116     
  Branches     1632     1640       +8     
==========================================
+ Hits        12404    12445      +41     
- Misses       6619     6694      +75     
  Partials      216      216              

Flag	Coverage Δ
server-test	70.50% <30.25%> (-0.29%)	⬇️
unittest	46.23% <ø> (ø)

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