fix(billing): Razorpay not defined error if checkout script loading takes time

[Bowrna]

fixes: #5934

[codecov]

Codecov Report

❌ Patch coverage is 0% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 44.06%. Comparing base (b2cecd5) to head (9b7a3f3).
⚠️ Report is 4195 commits behind head on develop.

Files with missing lines	Patch %	Lines
press/api/billing.py	0.00%	1 Missing ⚠️

❌ Your patch status has failed because the patch coverage (0.00%) is below the target coverage (75.00%). You can increase the patch coverage or adjust the target coverage.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #5937      +/-   ##
===========================================
- Coverage    44.07%   44.06%   -0.01%     
===========================================
  Files          772      772              
  Lines        55786    55801      +15     
===========================================
+ Hits         24588    24590       +2     
- Misses       31198    31211      +13     

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