# Returns a list of fixed fees.

`GET /psa/fixed-fees`

Group: PSA › Fixed Fees · Operation ID: `fixedFees`

The amount and its currency are the two halves of one stored value. They are present together or absent together, and neither is meaningful alone.

[Open in the interactive reference](https://docs.api.lensing.ai/?op=fixedFees)

## Parameters

| Name | In | Type | Required | Description |
| --- | --- | --- | --- | --- |
| `Api-Version` | header | `"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`. |

## Query surface

- `id` — filter by eq, ne, gt, gte, lt, lte, in, notIn, between, like
- `currency` — filter by eq, ne, gt, gte, lt, lte, in, notIn, between, like
- `frequency` — filter by eq, ne, gt, gte, lt, lte, in, notIn, between, like
- `startDate` — filter by eq, ne, gt, gte, lt, lte, in, notIn, between, like
- `endDate` — filter by eq, ne, gt, gte, lt, lte, in, notIn, between, like
- `psaProjectId` — filter by eq, ne, gt, gte, lt, lte, in, notIn, between, like
- `lastModifiedDate` — filter by eq, ne, gt, gte, lt, lte, in, notIn, between, like
- Orderable: id, frequency, currency, startDate, endDate, psaProjectId, lastModifiedDate
- Selectable: id, amount, currency, frequency, startDate, endDate, psaProjectId, salesOrderProductLineId, productId, productLineId, lastModifiedDate

## Response

`200` Success

Under `data`, an array of fixedFeesRow:

| Field | Type | Required | Description |
| --- | --- | --- | --- |
| `id` | string | no | The unique identifier for the fixed fee. |
| `amount` | string (decimal) or null | no | The fixed fee amount, in the currency given by currency. |
| `currency` | string or null | no | The currency of amount. Format ISO 4217, for example 'USD'. |
| `frequency` | string or null | no | The billing frequency of the fixed fee. Possible values: 'Monthly', 'BiMonthly', 'Quarterly', 'SemiAnnually', 'Annually', 'Once'. |
| `startDate` | string (date) or null | no | The first day of the fixed fee's billing period, inclusive. Format YYYY-MM-DD. |
| `endDate` | string (date) or null | no | The last day of the fixed fee's billing period, inclusive. Format YYYY-MM-DD. |
| `psaProjectId` | number | no | The id of the PSA project this fixed fee belongs to. It is a numeric package-layer key, not the UUID that GET psa/projects/:id takes. |
| `salesOrderProductLineId` | number or null | no | The id of the sales order product line this fixed fee fulfills. It is a numeric package-layer key. There is no endpoint for it. |
| `productId` | number or null | no | The id of the product this fixed fee is associated with. It is a numeric package-layer key, not the UUID that GET accounting/products/:id takes. |
| `productLineId` | number or null | no | The id of the product line this fixed fee is associated with. It is a numeric package-layer key, not the UUID that GET accounting/product-lines/:id takes. |
| `lastModifiedDate` | string (date-time) or null | no | The date and time the fixed fee record last changed, in UTC. Format YYYY-MM-DDTHH:mm:ss.sssZ. |

## Statuses

- `400` — Invalid request or business failure
- `401` — Missing or invalid access token
- `403` — Not authorized
- `404` — Not found
- `429` — Too many requests
- `500` — Internal server error