v1.0.0

Initial release of the Bachs Go SDK, covering the full v1 API surface.

Added

• Foundation — NewClient with WithBaseURL, WithSandbox,
  WithProduction, and WithHTTPClient options; defaults to the sandbox
  environment; context-first request pipeline with Authorization: Bearer
  auth, ResponseMeta (request ID + rate-limit headers), typed APIError
  with per-field validation errors, and POST-only idempotency keys enforced
  in the request builder.
• Checkouts — create and retrieve checkout sessions.
• Products — create, get, list, update, archive, and unarchive products.
• Customers — create, get, list, and update customers.
• Payments — get and list payments.
• Refunds — create, get, get-by-charge, and list refunds.
• Subscriptions — get, list, update (exactly-one-intent enforced
  client-side), and cancel. Deliberately no Create — subscriptions are only
  created by completing a checkout session for a recurring product.
• Transfers — create, get, and list transfers.
• Balances — get account balances (Misc).
• Media — upload, get, and delete media.
• Customer sessions — create portal sessions.
• Connected accounts — create/get/list accounts, request capabilities,
  account links, task checklists/values/submission, reusable identity,
  bank and mobile-money lookups, document uploads.
• Misc — payment methods, payment rails, supported currencies, and
  payout-supported currencies.
• Webhooks — webhook.ConstructEvent with HMAC-SHA256 signature
  verification, timestamp tolerance, and constant-time comparison.
• Examples — examples/checkout (product → checkout session → URL) and
  examples/webhook-server (raw-body verification + event dispatch).

Constraints honored

• Money is always a decimal string; IDs are opaque strings; timestamps are
  time.Time.
• No global mutable state; everything hangs off *Client.
• The API key never appears in errors, logs, or debug output.

Full Changelog: https://github.com/HalxDocs/bachs-go/blob/v1.0.0/CHANGELOG.md