Implement Go SDK subscription lifecycle with full API parity

[Smartdevs17]

Context

SubTrackr provides JavaScript, Python, and Go SDKs for programmatic subscription management. The Go SDK currently has incomplete coverage of the subscription lifecycle—missing critical operations like billing management, dunning, usage metering, and webhook verification—limiting adoption for Go-based backend integrations.
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Current Limitation

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• Go SDK only covers basic subscription CRUD; advanced endpoints lack implementations
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• No webhook signature verification utility in Go
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• Missing: dunning management, usage metering queries, billing operations
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• Error handling is inconsistent with JS/Python SDK patterns
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• No automatic retry with exponential backoff
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Expected Outcome

Feature-complete Go SDK with full API parity across subscription lifecycle: create, read, update, cancel, pause, reactivate, dunning, billing, metering, and webhook verification—matching JS SDK functionality.
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Acceptance Criteria

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• All subscription lifecycle endpoints are implemented in Go SDK
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• Webhook signature verification utility added
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• Automatic retry with exponential backoff for transient failures
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• Consistent error types matching JS/Python SDK conventions
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• Full test coverage with Go table-driven tests
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• Integration tests against sandbox environment
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• Generated reference documentation (godoc-compatible)
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• Example snippets for common subscription workflows
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Technical Scope

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• Files: sdks/go/ (entire directory), sdks/generated/endpoints.json
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• APIs: Subscription CRUD, BillingEngine, DunningService, UsageMetering, WebhookVerification
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• Edge cases: Pagination across large subscription sets, rate limit handling, network timeout behavior, nil/zero-value handling for optional fields

[kimanicode]

@kimanicode has applied to work on this issue as part of the Stellar Wave Program's 6th wave.

I'll jump on this one. I can handle bringing the Go SDK to full API parity for the subscription lifecycle. I will implement the missing advanced lifecycle operations (billing management, dunning, usage metering, and webhook signature verification) within sdks/go/. I'll also standardise our error handling to match the JS/Python SDK patterns, add automatic retries with exponential backoff for transient network failures, and write table-driven unit and integration tests against our sandbox. Finally, I'll ensure full godoc compatibility and include clear example workflow snippets.

Mind assigning this to me? Thanks.

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[vicistar-star]

@vicistar-star has applied to work on this issue as part of the Stellar Wave Program's 6th wave.

I can work on this please assign me

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[zainabwahab-eth]

@zainabwahab-eth has applied to work on this issue as part of the Stellar Wave Program's 6th wave.

Hello

I've love to be assigned this issue. I have experience as a backend dev and I've worked on similar issue so I'm sure I'd be able to resolve this. Thanks

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[AnnabelJoe]

@AnnabelJoe has applied to work on this issue as part of the Stellar Wave Program's 6th wave.

I would like to work on this

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[thefifthdev]

@thefifthdev has applied to work on this issue as part of the Stellar Wave Program's 6th wave.

I have full stack experience, engineer go backend and distributed systems. I can work on this

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