# Returns the milestone with the given identifier.

`GET /psa/milestones/{id}`

Group: PSA › Milestones · Operation ID: `getMilestone`

The psaProjectId, invoiceId, productId and productLineId on a milestone are numeric package-layer keys, not the UUIDs the public GET endpoints take, so none of them can be followed over this API.

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

## 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`. |
| `id` | path | string | yes | The unique identifier for the milestone to return. |

## Response

`200` Success

Under `data` (getMilestoneOutput):

| Field | Type | Required | Description |
| --- | --- | --- | --- |
| `id` | string | yes | The unique identifier for the milestone. |
| `name` | string | no | The display name of the milestone. |
| `description` | string | no | A free-form description of the milestone. |
| `amount` | string (decimal) | no | The milestone amount, in the currency given by currency. |
| `currency` | string | no | The currency of amount. Format ISO 4217, for example 'USD'. |
| `dueDate` | string (date) | no | The date the milestone is due for completion. Format YYYY-MM-DD. |
| `status` | string | no | The status of the milestone. Possible values: 'pending', 'accomplished', 'invoiced'. |
| `billable` | boolean | no | Whether the milestone is billable to a customer. |
| `psaProjectId` | number | yes | The id of the PSA project this milestone belongs to. It is a numeric package-layer key, not the UUID that GET psa/projects/:id takes. |
| `invoiceId` | number | no | The id of the invoice this milestone has been billed on. Absent when the milestone has not been invoiced. It is a numeric package-layer key, not the UUID that GET accounting/invoices/:id takes. |
| `productId` | number | no | The id of the product this milestone is associated with. It is a numeric package-layer key, not the UUID that GET accounting/products/:id takes. |
| `productLineId` | number | no | The id of the product line this milestone is associated with. It is a numeric package-layer key, not the UUID that GET accounting/product-lines/:id takes. |
| `lastModifiedDate` | string (date-time) | yes | The date and time the milestone record last changed, in UTC. Format YYYY-MM-DDTHH:mm:ss.sssZ. |

## Errors

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

## Statuses

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