# External Ids

The API allows certain end-points to be accessed via the externalId as supplied by the user.

The external parameter when used, lists the Ids that are to be replaced.

```
/v1/baseball/org/1/competitions/NL?external=competitionId
```

Below are a list of all the Ids that can be replaced. These Ids can be replaced in GET, POST, PUT & DELETE calls.

* competitionId
* seasonId
* fixtureId
* siteId
* venueId
* entityGroupId
* entityId
* personId

The allowable format of an externalId is any character except:

* / (forward slash)
* ? (question mark)
* & (ampersand)