> ## Documentation Index
> Fetch the complete documentation index at: https://www.marqeta.com/docs/llms.txt
> Use this file to discover all available pages before exploring further.

# Authorization Simulations Overview

> Use these endpoints to simulate authorization transactions and their related advice, clearing, reversal, incremental, and cash back messages.

Use these endpoints to simulate authorization transactions and their related advice, clearing, reversal, incremental, and cash back messages.

## Available operations

| Operation | Method | Endpoint |
| :- | :- | :- |
| [**Simulate authorization**](/docs/core-api/simulations-card-transactions/authorizations/simulate-authorization-v2) | POST | `/simulations/cardtransactions/authorization` |
| [**Simulate authorization advice**](/docs/core-api/simulations-card-transactions/authorizations/simulate-authorization-advice-v2) | POST | `/simulations/cardtransactions/authorization.advice` |
| [**Simulate authorization clearing**](/docs/core-api/simulations-card-transactions/authorizations/simulate-authorization-clearing) | POST | `/simulations/cardtransactions/authorization.clearing` |
| [**Simulate authorization reversal**](/docs/core-api/simulations-card-transactions/authorizations/simulate-authorization-reversal) | POST | `/simulations/cardtransactions/authorization.reversal` |
| [**Simulate incremental authorization**](/docs/core-api/simulations-card-transactions/authorizations/simulate-incremental-authorization) | POST | `/simulations/cardtransactions/authorization.incremental` |
| [**Simulate authorization cash back**](/docs/core-api/simulations-card-transactions/authorizations/simulate-authorization-cash-back) | POST | `/simulations/cardtransactions/authorization.cashback` |


## Related topics

- [Refund Simulations Overview](/docs/core-api/simulations-card-transactions/refunds.md)
- [PIN-Debit Simulations Overview](/docs/core-api/simulations-card-transactions/pin-debit.md)
- [ATM Withdrawal Simulations Overview](/docs/core-api/simulations-card-transactions/atm-withdrawals.md)
- [Quasi-Cash Simulations Overview](/docs/core-api/simulations-card-transactions/quasi-cash.md)
- [Simulations 2.0 — Card Transactions Overview](/docs/core-api/simulations-card-transactions.md)