Square APIs & SDKs: Build Custom Solutions on Square

## Square Developer Platform Documentation ## Developer Essentials Learn about the Square Developer platform and how Square APIs and SDKs work together. ### Build basics Learn about design concepts and patterns for building applications with Square APIs. - [Authentication](https://developer.squareup.com/docs/auth): Learn about client application authentication using Square authentication APIs. - [Access Tokens](https://developer.squareup.com/docs/build-basics/access-tokens): Learn about the different Square access tokens and how to generate the correct token for your needs. - [Square API Lifecycle](https://developer.squareup.com/docs/build-basics/api-lifecycle): Learn about the Square API lifecycle and what to expect for each stage of development. - [Clear Object Fields](https://developer.squareup.com/docs/build-basics/clearing-fields): Learn how to clear Square API resource fields using a standard method for all clearable fields. - [Idempotency](https://developer.squareup.com/docs/build-basics/common-api-patterns/idempotency): Learn about idempotency and how idempotency keys prevent negative results from accidental duplicate requests. - [Optimistic Concurrency](https://developer.squareup.com/docs/build-basics/common-api-patterns/optimistic-concurrency): Learn about optimistic concurrency and how it prevents lost data writes with Square APIs. - [Pagination](https://developer.squareup.com/docs/build-basics/common-api-patterns/pagination): Learn how Square API endpoints use pagination to efficiently provide listing results. - [Working with Addresses](https://developer.squareup.com/docs/build-basics/common-data-types/working-with-addresses): Learn how the Square API model works with address information. - [Working with Dates](https://developer.squareup.com/docs/build-basics/common-data-types/working-with-dates): Learn about how Square APIs model date information. - [ Working with Monetary Amounts](https://developer.squareup.com/docs/build-basics/common-data-types/wor