# Retrieve a fixed fee

Operation ID: `getFixedFee`

Group: PSA › Fixed Fees

[Open in the interactive reference](https://docs.api.lensing.ai/lensing/v1/endpoints/getFixedFee)

`GET /psa/fixed-fees/{id}`

Read-only: Reads and returns; changes nothing.

Retrieves a fixed fee. Each fixed fee has both amount and currency, or neither, because together they make one money value.

## Parameters

| Name | In | Type | Required | Description |
| --- | --- | --- | --- | --- |
| `Api-Version` | header | string · v1 | yes | The API version this request targets, named by its public identifier. Required on every request; omitting it, or naming a version this company does not have, is answered with 400. This document describes version `v1`. |
| `id` | path | string | yes | The unique identifier of the fixed fee you want to retrieve. Example: `"7c2e1b90-4a53-4f16-8de2-9b1035c7ef42"`. |

## Response

`200` Success

Under `data` (getFixedFeeOutput):

| Field | Type | Required | Description |
| --- | --- | --- | --- |
| `id` | string | yes | The unique identifier for the fixed fee. Example: `"7c2e1b90-4a53-4f16-8de2-9b1035c7ef42"`. |
| `amount` | decimal | no | The fixed fee amount, in the currency given by currency. Example: `"5000.00"`. |
| `currency` | string | no | The currency of amount. Format ISO 4217, for example 'USD'. Example: `"USD"`. |
| `frequency` | string | no | The billing frequency of the fixed fee. Possible values: 'Monthly', 'BiMonthly', 'Quarterly', 'SemiAnnually', 'Annually', 'Once'. Example: `"Monthly"`. |
| `startDate` | date | no | The first day of the fixed fee's billing period, inclusive. Format YYYY-MM-DD. Example: `"2026-01-01"`. |
| `endDate` | date | no | The last day of the fixed fee's billing period, inclusive. Format YYYY-MM-DD. Example: `"2026-12-01"`. |
| `psaProjectId` | number | yes | The id of the PSA project this fixed fee belongs to. It is a numeric key, not the UUID that GET psa/projects/:id takes. Example: `32341`. |
| `salesOrderProductLineId` | number | no | The id of the sales order product line this fixed fee fulfills. It is a numeric key. There is no endpoint for it. |
| `productId` | number | no | The id of the product this fixed fee is associated with. It is a numeric key, not the UUID that GET accounting/products/:id takes. |
| `productLineId` | number | no | The id of the product line this fixed fee is associated with. It is a numeric key, not the UUID that GET accounting/product-lines/:id takes. |
| `lastModifiedDate` | date-time | yes | The date and time the fixed fee record last changed, in UTC. Format YYYY-MM-DDTHH:mm:ss.sssZ. Example: `"2026-08-14T11:20:31.004Z"`. |

```json
{
  "data": {
    "id": "7c2e1b90-4a53-4f16-8de2-9b1035c7ef42",
    "amount": "5000.00",
    "currency": "USD",
    "frequency": "Monthly",
    "startDate": "2026-01-01",
    "endDate": "2026-12-01",
    "psaProjectId": 32341,
    "salesOrderProductLineId": 0,
    "productId": 0,
    "productLineId": 0,
    "lastModifiedDate": "2026-08-14T11:20:31.004Z"
  },
  "diagnostics": [
    {
      "code": "<code>",
      "message": "<message>",
      "severity": "error",
      "path": [
        "<path>"
      ],
      "details": "<details>"
    }
  ]
}
```

## Errors

| Code | Status |
| --- | --- |
| `NOT_FOUND` | 400 |

## Statuses

- `400` — Invalid request or business failure. Codes: NOT_FOUND
- `401` — The request carries no valid access token.
- `403` — Not authorized
- `404` — Not found
- `429` — Too many requests from this client address. The response has no body and no `Retry-After` header.
- `500` — Internal server error