Create transactional email

{
  "html": "<h1>Hello</h1>",
  "blocks": [
    {
      "id": "block_123",
      "type": "html",
      "content": "<h1>Hello</h1>",
      "styles": {
        "backgroundColor": "#f8fafc",
        "backgroundOpacity": 80,
        "textColor": "#111827",
        "borderRadius": 12,
        "borderColor": "#cbd5e1",
        "borderWidth": 1
      },
      "conditions": [
        {
          "id": "c1",
          "value": "plan:pro"
        }
      ]
    }
  ],
  "name": "Password Reset",
  "slug": "password-reset",
  "subject": "Reset your password, {{NAME}}",
  "previewText": "Use this link to reset your password.",
  "enabled": true
}

{
  "success": true,
  "transactional": {
    "labels": [
      "Billing",
      "Receipts"
    ],
    "id": "tx_abc123",
    "name": "Welcome Email",
    "slug": "welcome-email",
    "emailId": "email_123",
    "enabled": true,
    "managedBy": "dashboard",
    "variables": [
      "NAME",
      "COMPANY",
      "PRODUCT"
    ],
    "subject": "Welcome, {{NAME}}",
    "previewText": "Your account is ready.",
    "emailPreset": "branded",
    "blocks": [
      {
        "id": "block_123",
        "type": "html",
        "content": "<h1>Hello</h1>",
        "styles": {
          "backgroundColor": "#f8fafc",
          "backgroundOpacity": 80,
          "textColor": "#111827",
          "borderRadius": 12,
          "borderColor": "#cbd5e1",
          "borderWidth": 1
        },
        "conditions": [
          {
            "id": "c1",
            "value": "plan:pro"
          }
        ]
      }
    ],
    "email": {
      "id": "email_123",
      "companyId": "company_123",
      "name": "Welcome email",
      "subject": "Welcome",
      "previewText": "Here's what to do next",
      "blocks": [
        {
          "id": "block_123",
          "type": "html",
          "content": "<h1>Hello</h1>",
          "styles": {
            "backgroundColor": "#f8fafc",
            "backgroundOpacity": 80,
            "textColor": "#111827",
            "borderRadius": 12,
            "borderColor": "#cbd5e1",
            "borderWidth": 1
          },
          "conditions": [
            {
              "id": "c1",
              "value": "plan:pro"
            }
          ]
        }
      ]
    }
  },
  "warnings": [
    "blocks[0].styles.color is not a supported field and was ignored. Button label color comes from the block-level `buttonTextColor` field. Supported styles fields: backgroundColor, backgroundOpacity, bleed, borderColor, borderRadius, borderWidth, keepAlign, paddingBottom, paddingLeft, paddingRight, paddingTop, textAlign, textColor."
  ]
}