Named credential callout options.
| Property Name | Type | Description | Available Version |
|---|---|---|---|
| allowMergeFieldsInBody | Boolean | Specifies whether to allow merge fields in the HTTP body (true) or not (false). | 58.0 |
| allowMergeFieldsInHeader | Boolean | Specifies whether to allow merge fields in the HTTP header (true) or not (false). | 58.0 |
| generateAuthorizationHeader | Boolean | Specifies whether to generate an authorization header (true) or not (false). | 58.0 |