- Replace map[string]interface{} with map[string]any in GraphQL, metrics, payment gateway, and webhook handlers
- Replace []byte(fmt.Sprintf()) with fmt.Appendf(nil, ...) for cursor encoding in GraphQL resolvers and tests
- Replace strings.HasPrefix/TrimPrefix with strings.CutPrefix for webhook signature parsing
- Replace stripe.Int64/Bool with new() constructor for Stripe payment parameters
- Rename Error
- Add parseID tests for valid IDs, invalid format, and zero values
- Add encodeCursor/decodeCursor tests for base64 cursor encoding/decoding with valid and invalid inputs
- Add buildUsageFilterWhere tests for empty filters, usage type filtering, and cost range filtering
- Add ResolverRoot method tests to verify Query/Mutation/Subscription return receiver
- Include helper function implementations (encodeCursor, decodeCursor, buildUsageFilterWhere)
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