> For the complete documentation index, see [llms.txt](https://docs.cheesecakelabs.com/stellar-plus/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.cheesecakelabs.com/stellar-plus/reference/core.md).

# Core

- [Contract Engine](https://docs.cheesecakelabs.com/stellar-plus/reference/core/contract-engine.md)
- [Pipelines](https://docs.cheesecakelabs.com/stellar-plus/reference/core/pipelines.md)
- [Build Transaction](https://docs.cheesecakelabs.com/stellar-plus/reference/core/pipelines/build-transaction.md)
- [Classic Signing Requirements](https://docs.cheesecakelabs.com/stellar-plus/reference/core/pipelines/classic-signing-requirements.md)
- [Fee Bump](https://docs.cheesecakelabs.com/stellar-plus/reference/core/pipelines/fee-bump.md)
- [Sign Transaction](https://docs.cheesecakelabs.com/stellar-plus/reference/core/pipelines/sign-transaction.md)
- [Soroban Auth](https://docs.cheesecakelabs.com/stellar-plus/reference/core/pipelines/sign-transaction-1.md)
- [Simulate Transaction](https://docs.cheesecakelabs.com/stellar-plus/reference/core/pipelines/simulate-transaction.md)
- [Soroban Get Transaction](https://docs.cheesecakelabs.com/stellar-plus/reference/core/pipelines/soroban-get-transaction.md)
- [Submit Transaction](https://docs.cheesecakelabs.com/stellar-plus/reference/core/pipelines/submit-transaction.md)
- [Soroban Transaction](https://docs.cheesecakelabs.com/stellar-plus/reference/core/pipelines/soroban-transaction.md)
- [Classic Transaction](https://docs.cheesecakelabs.com/stellar-plus/reference/core/pipelines/classic-transaction.md)