> ## 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. # Simulate authorization advice > An authorization advice allows an amount to be decreased after the authorization. POST/simulate/authorization/advice An authorization advice allows an amount to be decreased after the authorization. This endpoint allows you to simulate post-swipe adjustments. Simulate an `authorization.advice` type transaction by including the `original_transaction_token` and other authorization details in your request. ## Body field details | Fields | Description | | - | - | | amount decimal Required | The amount of the transaction. **Allowable Values:** Format: 0.00 | | original\_transaction\_token string Required | The unique token that identifies the original transaction. **Allowable Values:** Existing transaction token. | | transaction\_options object Optional | Contains additional information about the transaction. **Allowable Values:** | | network\_fees array of objects Optional | Simulates various types of fees levied on the transaction. **Allowable Values:** A valid array of `network_fees` objects. | | webhook object Optional | Allows information to be posted asynchronously to endpoints hosted in your environment. **Allowable Values:** A valid `webhook` object. | ## The transaction\_options object | Fields | Description | | - | - | | additional\_data string Optional | Additional information about the transaction. **Allowable Values:** 255 char max | ## The network\_fees object | Fields | Description | | - | - | | type string Required | Specifies the type of fee. - **ISSUER\_FEE** – Fee charged by the issuing bank. Does not impact account balance. - **SWITCH\_FEE** – Fee charged per transaction by the card network. Does not impact account balance. - **PINDEBIT\_ASSOC\_FEE** – Fee associated with a PIN-debit transaction, such as at an ATM. Impacts account balance. - **ACQUIRER\_FEE** – Fee charged by the acquiring bank. Impacts account balance. - **INTERCHANGE\_FEE** – Fee charged per transaction by the card network. Does not impact account balance. - **CUR\_CONV\_CARDHOLDER\_FEE** – Currency conversion fee charged to the cardholder by the card network. Impacts account balance. - **CUR\_CONV\_ISSUER\_FEE** – Currency conversion fee paid for by the issuer. Does not impact account balance. - **CROSS\_BORDER\_ISSUER\_FEE** – Cross-border fee charged by the network, and paid for by the issuer. Does not impact account balance. **Allowable Values:** `ISSUER_FEE`, `SWITCH_FEE`, `PINDEBIT_ASSOC_FEE`, `ACQUIRER_FEE`, `INTERCHANGE_FEE`, `CUR_CONV_CARDHOLDER_FEE`, `CUR_CONV_ISSUER_FEE`, `CROSS_BORDER_ISSUER_FEE` | | amount decimal Optional | Specifies the amount of the fee. **Allowable Values:** Format: 0.00 | | credit\_debit string Optional | Specifies whether the fee credits or debits the account balance. **Allowable Values:** C, D The default value depends on the setting of the `type` field, as listed below: Fee Type / Default `ISSUER_FEE` / C `SWITCH_FEE` / D `PINDEBIT_ASSOC_FEE` / D `ACQUIRER_FEE` / D `INTERCHANGE_FEE` / C `CUR_CONV_CARDHOLDER_FEE` / D `CUR_CONV_ISSUER_FEE` / C `CROSS_BORDER_ISSUER_FEE` / C | ## The webhook object | Fields | Description | | - | - | | endpoint string Optional | Endpoint to which a copy of the response is sent. **Allowable Values:** - HTTPS URL - 250 char max - Empty string not allowed | | username string Optional | Username for accessing the endpoint. **Allowable Values:** 50 char max | | password string Optional | Password for accessing the endpoint. **Allowable Values:** No restrictions | ## Sample request body ```json JSON lines wrap theme={null} { "amount": "1.00", "original_transaction_token": "9cbbdb91-81bb-4d26-acea-2734a67a96d2" } ``` ## Sample response body ```json JSON expandable lines wrap theme={null} { "type": "authorization.advice", "state": "PENDING", "token": "78e61ee3-f811-49b0-ab58-1f485d353b3z", "user_token": "b2d2c739-a9fe-4af0-9f34-964aae4c3e31", "acting_user_token": "b2d2c739-a9fe-4af0-9f34-964aae4c3e31", "card_token": "4abf0fe1-2470-4cc8-b83e-c7db9a59bcdb", "preceding_related_transaction_token": "9cbbdb91-81bb-4d26-acea-2734a67a96d2", "gpa": { "currency_code": "USD", "ledger_balance": 11, "available_balance": 0, "credit_balance": 0, "pending_credits": 0, "impacted_amount": -1, "balances": { "USD": { "currency_code": "USD", "ledger_balance": 11, "available_balance": 0, "credit_balance": 0, "pending_credits": 0, "impacted_amount": -1 } } }, "gpa_order": { "token": "3f55f689-7622-4660-9ce9-209a9e6b1a5a", "amount": 9, "created_time": "2024-07-11T16:30:00Z", "last_modified_time": "2024-07-11T16:32:42Z", "transaction_token": "913ad4fe-dfec-46af-ae0f-dda84c90edd6", "state": "PENDING", "response": { "code": "0000", "memo": "Approved or completed successfully" }, "funding": { "amount": 9, "source": { "type": "program", "token": "**********b4c2", "active": true, "name": "PFS for simulating transactions", "is_default_account": false, "created_time": "2024-07-10T00:09:35Z", "last_modified_time": "2024-07-10T00:09:35Z" } }, "funding_source_token": "**********b4c2", "user_token": "b2d2c739-a9fe-4af0-9f34-964aae4c3e31", "currency_code": "USD" }, "duration": 198, "created_time": "2024-07-11T16:32:42Z", "user_transaction_time": "2024-07-11T16:30:00Z", "settlement_date": "2024-07-11T00:00:00Z", "request_amount": 1, "amount": 1, "issuer_interchange_amount": 0, "currency_code": "USD", "approval_code": "015382", "response": { "code": "0000", "memo": "Approved or completed successfully" }, "network": "VISA", "subnetwork": "VISANET", "acquirer_fee_amount": 0, "acquirer": { "institution_id_code": "000000", "system_trace_audit_number": "000001" }, "user": { "metadata": {} }, "card": { "metadata": {} }, "card_acceptor": { "mid": "11111", "mcc": "6411", "name": "Aegis Fleet Services", "street_address": "111 Main St", "city": "Berkeley", "state": "CA", "zip": "94702", "country_code": "USA" }, "pos": { "partial_approval_capable": false, "purchase_amount_only": false, "is_recurring": false } } ``` ## Related topics - [Simulate authorization advice](https://www.marqeta.com/docs/core-api/simulations-card-transactions/authorizations/simulate-authorization-advice-v2.md) - [Authorization Simulations Overview](https://www.marqeta.com/docs/core-api/simulations-card-transactions/authorizations.md) - [Simulating Transactions Overview](https://www.marqeta.com/docs/core-api/simulating-transactions.md) - [Simulations 2.0 — Card Transactions Overview](https://www.marqeta.com/docs/core-api/simulations-card-transactions.md) - [Simulate financial advice](https://www.marqeta.com/docs/core-api/simulating-transactions/simulate-financial-advice.md)