Add create cert API call

Author: maxvp

src/content/docs/cloudflare-one/connections/connect-devices/user-side-certificates/index.mdx

@@ -7,6 +7,8 @@ banner:
   content: The default global Cloudflare root certificate will expire on 2025-02-02. If you installed the default Cloudflare certificate before 2024-10-17, you must <a href="/cloudflare-one/connections/connect-devices/user-side-certificates/#generate-a-cloudflare-root-certificate">generate a new certificate</a> and activate it for your Zero Trust organization to avoid inspection errors.
 ---
 
+import { Tabs, TabItem } from "~/components";
+
 Advanced security features such as [HTTPS traffic inspection](/cloudflare-one/policies/gateway/http-policies/tls-decryption/), [Data Loss Prevention](/cloudflare-one/policies/data-loss-prevention/), [anti-virus scanning](/cloudflare-one/policies/gateway/http-policies/antivirus-scanning/), [Access for Infrastructure](/cloudflare-one/applications/non-http/infrastructure-apps/), and [Browser Isolation](/cloudflare-one/policies/browser-isolation/) require users to install and trust a root certificate on their device. You can either install the certificate provided by Cloudflare (default option), or generate your own custom certificate and upload it to Cloudflare.
 
 Gateway [generates a unique root CA](#generate-a-cloudflare-root-certificate) for each Zero Trust account and deploys it across the Cloudflare global network. Alternatively, Enterprise users can upload and deploy their own [custom certificate](/cloudflare-one/connections/connect-devices/user-side-certificates/custom-certificate/).
@@ -26,12 +28,30 @@ Zero Trust will indicate if a certificate is ready for use in inspection based o
 
 To generate a new Cloudflare root certificate for your Zero Trust organization:
 
+<Tabs syncKey="dashPlusAPI"> <TabItem label="Dashboard">
+
 1. In [Zero Trust](https://one.dash.cloudflare.com/), go to **Settings** > **Resources**.
 2. In **Certificates**, select **Manage**.
 3. Select **Generate certificate**.
 4. Choose a duration of time before the certificate expires. Cloudflare recommends expiration after five years. Alternatively, choose _Custom_ and enter a custom amount in days.
 5. Select **Generate certificate**.
 
+</TabItem>
+
+<TabItem label="API">
+
+Send a `POST` request to the [Create Zero Trust certificate](/api/resources/zero_trust/subresources/gateway/subresources/certificates/methods/create/) endpoint. For example:
+
+```sh
+curl https://api.cloudflare.com/client/v4/accounts/{account_id}/gateway/certificates \
+--header "Content-Type: application/json" \
+--header "Authorization: Bearer <API_TOKEN>" \
+```
+
+The API will respond with the ID and contents of the new certificate.
+
+</TabItem> </Tabs>
+
 The certificate will appear in your list of certificates as **Inactive**. To download a generated certificate, select it, then choose **Download .pem** and/or **Download .crt**. To deploy your certificate and turn it on for inspection, you need to [activate the certificate](#activate-a-root-certificate).
 
 Each Zero Trust account can generate a new root certificate a maximum of three times per day.