Fix Plain user customer card

[marcoacierno]

in the Plain endpoint used in the customer cards, we only include the grant key if the user has a grant but Plain expects it to be always there. We should update the endpoint to include grant with an empty dictionary if the user has no grant

[marcoacierno]

@claude work on this

[claude]

Claude finished @marcoacierno's task in 1m 32s —— View job • claude/issue-4553-20260203-1721 • Create PR ➔

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Fix Plain User Customer Card

• Find the Plain customer card endpoint code
• Implement the fix - return empty grant card when user doesn't exist
• Update tests to verify empty grant card for missing user
• Commit and push changes

Summary

The issue was in backend/integrations/views.py. When a user was not found, the endpoint returned {"cards": []} — an empty array with no grant card entry. Plain expects all requested cardKeys to always have a corresponding entry in the response.

Changes:

• backend/integrations/views.py: Removed the early return for missing users. Now when "grant" is in cardKeys but the user doesn't exist, we return {"key": "grant", "components": []} (same empty structure already used when a user exists but has no grant).
• backend/integrations/tests/test_views.py: Updated the test_cannot_get_plain_customer_cards_when_user_doesnt_exist test to expect the empty grant card in the response instead of an empty cards array.

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