fix: added missing saas api's

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 0% with 13 lines in your changes missing coverage. Please review.

Project coverage is 39.98%. Comparing base (c0759bf) to head (f87801e). Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
press/saas/api/billing.py	0.00%	13 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #2270 +/- ## ========================================== - Coverage 39.99% 39.98% -0.02% ========================================== Files 371 371 Lines 28132 28141 +9 ========================================== Hits 11252 11252 - Misses 16880 16889 +9 ```

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