* feat(api)!: add semi_annual cadence and remove metadata from update items (#288)

* docs: small updates (#290)

* feat(api): updates (#291)

* chore(internal): add a `default_query` method (#292)

* chore(docs): improve Coupon description (#293)

* fix(client/async): avoid blocking io call for platform headers (#294)

* feat(api): add support for adding allocation price to subscription (#295)

* feat(api): external connections made optional when updating items (#296)

* fix(api)!: endpoint expects amount of new allocation price to be a string, not a number (#297)

# Migration
This change is fixing the SDK to use the correct `string` type expected by the API. The spec was incorrectly specifying a type `number` but the endpoint expected a string.
While this change is technically an SDK breaking change the previous types weren't accurately representing the API behaviour.
To migrate, be sure to use a string representation of the new allocation price amount.

* fix(docs): fix link to advanced python httpx docs (#298)

* fix: temporarily patch upstream version to fix broken release flow (#299)

* fix(build): include more files in sdist builds (#300)

* feat(api): add support for query param include_all_blocks (#301)

* chore(docs): updates price intervals docs (#302)

* chore(deps): bump anyio to v4.4.0 (#303)

* chore(internal): add reflection helper function (#304)

* chore: gitignore test server logs (#305)

* chore(internal): add rich as a dev dependency (#306)

it's often very helpful when writing demo scripts

* chore(internal): add helper method for constructing `BaseModel`s (#307)

* fix(client): always respect content-type multipart/form-data if provided (#308)

* chore(ci): update rye to v0.35.0 (#309)

* feat(api): add 'status' to plan creation params (#310)

* chore(internal): minor request options handling changes (#311)

* chore(internal): add helper function (#312)

* chore(internal): update mypy (#313)

* chore(ci): also run workflows for PRs targeting `next` (#314)

* chore(internal): minor import restructuring (#315)

* docs(examples): use named params more (#316)

* chore(internal): minor options / compat functions updates (#317)

* chore(docs): minor update to formatting of API link in README (#318)

* chore(internal): update formatting (#319)

* chore(internal): update formatting (#320)

* feat(api): add methods to prices and invoices (#321)

* chore(docs): document how to do per-request http client customization (#322)

* chore(ci): limit release doctor target branches (#323)

* docs(readme): fix example snippet imports (#324)

* chore(tests): update prism version (#325)

* chore: fix error message import example (#326)

* feat(api): add cadence enum value 'custom' (#327)

* chore(internal): add type construction helper (#328)

* feat(api): deprecate methods 'customers.usage.create' and 'customers.usage.update_by_external_id' (#329)

Please use the 'events.backfills.create' instead.
See https://docs.withorb.com/reference/create-backfill for more details.

* feat(api)!: remove methods 'customers.usage.create' and 'customers.usage.update_by_external_id' (#330)

## Migration
The two methods `customers.usage.create` and `customers.usage.update_by_external_id` have been removed from the SDK and the API.
Please use 'events.backfills.create' instead.
More details for this endpoint can be found at https://docs.withorb.com/reference/create-backfill

* release: 2.0.0

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Co-authored-by: stainless-app[bot] <142633134+stainless-app[bot]@users.noreply.github.com>