# Update Expense

Update an existing expense. All fields are required.

Endpoint: PUT /expenses/{expenseId}
Version: 2.0.0
Security: oauth2, apiKey

## Path parameters:

  - `expenseId` (string, required)
    UUID of the expense
    Example: "a1b2c3d4-e5f6-7890-abcd-ef1234567890"

## Request fields (application/json):

  - `expense_name` (string, required)
    Example: "Office Supplies Updated"

  - `date` (string)
    Example: "2024-01-15"

  - `amount` (number)
    Example: 200

  - `category_id` (string)
    UUID of the expense category
    Example: "a1b2c3d4-e5f6-7890-abcd-ef1234567890"

  - `project_id` (integer)
    ID of the project (optional)
    Example: 100

  - `note` (string)
    Additional notes about the expense
    Example: "Updated expense details"

  - `is_billable` (boolean)
    Whether the expense is billable
    Example: true

## Response 200 fields (application/json):

  - `success` (boolean)
    Example: true

  - `data` (object,null)

  - `message` (string)
    Example: "Expense updated successfully"

  - `meta` (object)

  - `meta.api_version` (string)
    Example: "2.0.0"

  - `meta.timestamp` (string)

## Response 400 fields (application/json):

  - `success` (boolean, required)

  - `message` (string, required)
    Error message describing what went wrong
    Example: "An error occurred"

  - `error` (string,null)
    Optional additional error details
    Example: "Internal Server Error"

  - `meta` (object, required)

  - `meta.api_version` (string)
    Example: "2.0.0"

  - `meta.timestamp` (string)

## Response 401 fields (application/json):

  - `success` (boolean, required)

  - `message` (string, required)
    Error message describing what went wrong
    Example: "An error occurred"

  - `error` (string,null)
    Optional additional error details
    Example: "Internal Server Error"

  - `meta` (object, required)

  - `meta.api_version` (string)
    Example: "2.0.0"

  - `meta.timestamp` (string)

## Response 403 fields (application/json):

  - `success` (boolean, required)

  - `message` (string, required)
    Error message describing what went wrong
    Example: "An error occurred"

  - `error` (string,null)
    Optional additional error details
    Example: "Internal Server Error"

  - `meta` (object, required)

  - `meta.api_version` (string)
    Example: "2.0.0"

  - `meta.timestamp` (string)

## Response 404 fields (application/json):

  - `success` (boolean, required)

  - `message` (string, required)
    Error message describing what went wrong
    Example: "An error occurred"

  - `error` (string,null)
    Optional additional error details
    Example: "Internal Server Error"

  - `meta` (object, required)

  - `meta.api_version` (string)
    Example: "2.0.0"

  - `meta.timestamp` (string)

## Response 422 fields (application/json):

  - `success` (boolean, required)

  - `message` (string, required)
    Example: "Validation failed"

  - `errors` (object, required)
    Object containing validation error messages for each field
    Example: {"email":["The email field is required.","The email must be a valid email address."],"firstname":["The firstname field is required."],"role":["The selected role is invalid."]}

  - `meta` (object, required)

  - `meta.api_version` (string)
    Example: "2.0.0"

  - `meta.timestamp` (string)

## Response 500 fields (application/json):

  - `success` (boolean, required)

  - `message` (string, required)
    Error message describing what went wrong
    Example: "An error occurred"

  - `error` (string,null)
    Optional additional error details
    Example: "Internal Server Error"

  - `meta` (object, required)

  - `meta.api_version` (string)
    Example: "2.0.0"

  - `meta.timestamp` (string)