diff --git a/restapi/restendpoints.md b/restapi/restendpoints.md
index f641529..340f6a5 100644
--- a/restapi/restendpoints.md
+++ b/restapi/restendpoints.md
@@ -1188,6 +1188,126 @@ curl -X POST \
   "https://cloud.handpoint.io/moto/reversal"
 ```
 
+## Reversal Operations <span class="badge badge--warning">Beta</span>
+
+The Reversal endpoint allows you to **reverse any reversible transaction** (authorization, payment or refund) using only its identifier. The reversal is processed against the Handpoint gateway via Cloud API without requiring a physical payment terminal.
+
+Cloud API currently supports:
+
+- `POST /v1/reversal` — reverses a transaction identified by `originalGuid`.
+
+All request and response payloads are defined in [Reversal objects](restobjects#reversal).
+
+---
+
+### /v1/reversal
+
+`Reversal`
+
+`POST /v1/reversal` is used to **reverse (void)** a previously completed transaction. The operation is linked to the original transaction via `originalGuid`. No card data is sent; the gateway resolves the original transaction internally.
+
+Reversals are typically used to cancel an authorization or payment shortly after it was processed, subject to acquirer rules. For partial reversals, provide `amount` and `currency` to release only part of the held funds.
+
+#### Parameters
+
+| Parameter | Notes |
+| --------- | ----- |
+| `Header: ApiKeyCloud` <span class="badge badge--primary">Required</span> | Cloud API key used to authenticate the merchant. |
+| `Request Body: ViscusReversalRequest` <span class="badge badge--primary">Required</span> | [ViscusReversalRequest](restobjects#viscusReversalRequest) object identifying the transaction to reverse. |
+
+Typical fields (see [ViscusReversalRequest](restobjects#viscusReversalRequest) for full details):
+
+* `originalGuid` <span class="badge badge--primary">Required</span> – GUID of the transaction to reverse.
+* `messageReasonCode` <span class="badge badge--secondary">Optional</span> – ISO 8583 reason code. Defaults to `CUSTOMER_CANCELLATION` when not provided.
+* `timestamp` <span class="badge badge--secondary">Optional</span> – Terminal timestamp in `YYYYMMDDHHmmssSSS` format. Defaults to the current server time when not provided.
+* `amount` <span class="badge badge--secondary">Optional</span> – Amount to reverse, for partial reversals only (e.g. `"15.00"`).
+* `currency` <span class="badge badge--secondary">Optional</span> – ISO 4217 3-character code, for partial reversals only (e.g. `"EUR"`).
+
+#### Returns
+
+| Result | Notes |
+| ------ | ----- |
+| `200` | Reversal accepted and processed. Response body is a parsed gateway object. |
+| `400` | Business rule error from the gateway (for example, unknown `originalGuid` or reversal not allowed). Returned as `BadRequestError` with `error.code` and `error.details`. |
+| `403` | Forbidden — the API key does not belong to a merchant, or the merchant is not configured. |
+| `422` | Payload validation error (`VALIDATION_FAILED`) — `originalGuid` is missing, `messageReasonCode` is not one of the allowed values, or `currency` is not exactly 3 characters. |
+
+#### Behaviour examples
+
+* **Happy path – full reversal**
+
+  ```shell
+  curl -X POST \
+    -H "Content-Type: application/json" \
+    -H "ApiKeyCloud: XXXXXXX-XXXXXXX-XXXXXXX-XXXXXXX" \
+    -d '{
+      "originalGuid": "0c9d9df0-48ec-11eb-81a1-470a19c80d3a"
+    }' \
+    "https://cloud.handpoint.io/v1/reversal"
+  ```
+
+* **Partial reversal**
+
+  ```shell
+  curl -X POST \
+    -H "Content-Type: application/json" \
+    -H "ApiKeyCloud: XXXXXXX-XXXXXXX-XXXXXXX-XXXXXXX" \
+    -d '{
+      "originalGuid": "0c9d9df0-48ec-11eb-81a1-470a19c80d3a",
+      "amount": "15.00",
+      "currency": "EUR"
+    }' \
+    "https://cloud.handpoint.io/v1/reversal"
+  ```
+
+* **With explicit reason code**
+
+  ```shell
+  curl -X POST \
+    -H "Content-Type: application/json" \
+    -H "ApiKeyCloud: XXXXXXX-XXXXXXX-XXXXXXX-XXXXXXX" \
+    -d '{
+      "originalGuid": "0c9d9df0-48ec-11eb-81a1-470a19c80d3a",
+      "messageReasonCode": "TIMEOUT_WAITING_FOR_RESPONSE"
+    }' \
+    "https://cloud.handpoint.io/v1/reversal"
+  ```
+
+* **Validation error – missing `originalGuid`**
+
+  ```json
+  {
+    "error": {
+      "statusCode": 422,
+      "name": "UnprocessableEntityError",
+      "message": "The request body is invalid.",
+      "code": "VALIDATION_FAILED",
+      "details": [
+        {
+          "path": "",
+          "code": "required",
+          "message": "must have required property 'originalGuid'",
+          "info": { "missingProperty": "originalGuid" }
+        }
+      ]
+    }
+  }
+  ```
+
+#### Code example – full reversal
+
+```shell
+curl -X POST \
+  -H "Content-Type: application/json" \
+  -H "ApiKeyCloud: XXXXXXX-XXXXXXX-XXXXXXX-XXXXXXX" \
+  -d '{
+    "originalGuid": "0c9d9df0-48ec-11eb-81a1-470a19c80d3a"
+  }' \
+  "https://cloud.handpoint.io/v1/reversal"
+```
+
+---
+
 ## Batch Operations <span class="badge badge--warning">Beta</span>
 
 :::info
diff --git a/restapi/restobjects.md b/restapi/restobjects.md
index a2125c9..5495b8a 100644
--- a/restapi/restobjects.md
+++ b/restapi/restobjects.md
@@ -1047,6 +1047,86 @@ The exact shape is very similar across these operations; some fields (such as `o
 }
 ```
 
+## Reversal {#reversal}
+
+### ViscusReversalRequest {#viscusReversalRequest}
+
+`ViscusReversalRequest` <span class="badge badge--info">Object</span>
+
+Object used by the [`POST /v1/reversal`](restendpoints#reversal-operations) endpoint to reverse any reversible transaction. Only `originalGuid` is required; all other fields are optional and default to sensible values when not provided.
+
+**Properties**
+
+| Property | Description |
+| -------- | ----------- |
+| `originalGuid` <span class="badge badge--primary">Required</span> <br />*String* | GUID of the transaction to reverse (maximum 64 characters). |
+| `messageReasonCode` <span class="badge badge--secondary">Optional</span> <br />*String* | ISO 8583 reason code for the reversal. Defaults to `CUSTOMER_CANCELLATION` when not provided. See [allowed values](#messageReasonCode) below. |
+| `timestamp` <span class="badge badge--secondary">Optional</span> <br />*String* | Timestamp in `YYYYMMDDHHmmssSSS` format (17 characters). Defaults to the current server time when not provided. |
+| `amount` <span class="badge badge--secondary">Optional</span> <br />*String* | Amount to reverse for partial reversals (e.g. `"15.00"`). When provided together with `currency`, only the specified amount is released from the hold. The most recent reversal received supersedes any earlier partial reversal. |
+| `currency` <span class="badge badge--secondary">Optional</span> <br />[*Currency*](#currency) | ISO 4217 3-character currency code for partial reversals (e.g. `"EUR"`). Must be exactly 3 characters. |
+
+#### Allowed values for `messageReasonCode` {#messageReasonCode}
+
+| Value | Description |
+| ----- | ----------- |
+| `CUSTOMER_CANCELLATION` | Transaction cancelled by the customer. **Default when not provided.** |
+| `UNSPECIFIED_NO_ACTION_TAKEN` | No action taken; reason unspecified. |
+| `SUSPECTED_MALFUNCTION` | Terminal malfunction suspected. |
+| `FORMAT_ERROR_NO_ACTION_TAKEN` | Format error with no action taken. |
+| `COMPLETED_PARTIALLY` | Transaction completed only partially. |
+| `ORIGINAL_AMOUNT_INCORRECT` | The original transaction amount was incorrect. |
+| `RESPONSE_RECEIVED_TOO_LATE` | Response from the acquirer arrived after the timeout. |
+| `CARD_ACCEPTOR_DEVICE_UNABLE_TO_COMPLETE_TRANSACTION` | The terminal was unable to complete the transaction. |
+| `DEPOSIT_OUT_OF_BALANCE` | Deposit amount does not balance. |
+| `NO_CHECK_IN_ENVELOPE` | No check found in the deposit envelope. |
+| `PAYMENT_OUT_OF_BALANCE` | Payment amount does not balance. |
+| `DEPOSIT_OUT_OF_BALANCE_APPLIED_CONTENTS` | Deposit out of balance after applying contents. |
+| `PAYMENT_OUT_OF_BALANCE_APPLIED_CONTENTS` | Payment out of balance after applying contents. |
+| `UNABLE_TO_DELIVER_MESSAGE_TO_POINT_OF_SERVICE` | Message could not be delivered to the point of service. |
+| `SUSPECTED_MALFUNCTION_CARD_RETAINED` | Malfunction suspected; card was retained. |
+| `SUSPECTED_MALFUNCTION_CARD_RETURNED` | Malfunction suspected; card was returned. |
+| `SUSPECTED_MALFUNCTION_TRACK_3_NOT_UPDATED` | Malfunction suspected; track 3 was not updated. |
+| `SUSPECTED_MALFUNCTION_NO_CASH_DISPENSED` | Malfunction suspected; no cash was dispensed. |
+| `TIMED_OUT_AT_TAKING_MONEY_NO_CASH_DISPENSED` | Timed out while taking money; no cash dispensed. |
+| `TIMED_OUT_AT_TAKING_CARD_CARD_RETAINED_AND_NO_CASH_DISPENSED` | Timed out taking card; card retained and no cash dispensed. |
+| `INVALID_RESPONSE_NO_ACTION_TAKEN` | Invalid response received; no action taken. |
+| `TIMEOUT_WAITING_FOR_RESPONSE` | Timed out waiting for a response from the acquirer. |
+| `PREMATURE_CHIP_CARD_REMOVAL` | Chip card was removed before the transaction completed. |
+| `CHIP_CARD_DECLINES_TRANSACTION` | Chip card declined the transaction. |
+| `SIGNATURE_TIMEOUT` | Signature capture timed out. |
+| `MERCHANT_REVERSAL_SIGNATURE_DECLINED` | Merchant-initiated reversal; signature was declined. |
+| `NO_REVERSAL_REASON_CODE` | No specific reason code applies. |
+
+**Code example – full reversal (defaults)**
+
+```json
+{
+  "originalGuid": "0c9d9df0-48ec-11eb-81a1-470a19c80d3a"
+}
+```
+
+**Code example – partial reversal**
+
+```json
+{
+  "originalGuid": "0c9d9df0-48ec-11eb-81a1-470a19c80d3a",
+  "amount": "15.00",
+  "currency": "EUR"
+}
+```
+
+**Code example – with explicit reason code and timestamp**
+
+```json
+{
+  "originalGuid": "0c9d9df0-48ec-11eb-81a1-470a19c80d3a",
+  "messageReasonCode": "TIMEOUT_WAITING_FOR_RESPONSE",
+  "timestamp": "20240101120000000"
+}
+```
+
+---
+
 ## Batch {#batch}
 
 ### BatchCloseRequest {#batchCloseRequest}