# PATCH /forms/templates/:id/fields/:fieldId

**Resource:** [Forms](./forms.md)  
**Scopes:** `forms:write`  
**Write operation:** yes

Update a field on a form template. Use content to update CRM Variable Injection mapping.

## Parameters

| Name | In | Type | Required | Description |
|------|----|------|----------|-------------|
| `id` | path | uuid | yes | Template ID |
| `fieldId` | path | uuid | yes | Field ID |
| `label` | body | string | no | Field label |
| `content` | body | object | no | Field config including optional crm_variable and crm_variable_mode |

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Base URL: `https://api.trustpager.com/functions/v1/api/v1` — Auth: `Authorization: Bearer YOUR_API_KEY`