Fixed Swift compilation error by explicitly passing httpClient parameter
to SubscriptionApi constructor. Kotlin default parameters are not
available when calling from Swift.
Changed from:
SubscriptionApi()
To:
SubscriptionApi(client: ApiClient.shared.httpClient)
iOS build now succeeds.
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude <noreply@anthropic.com>
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