docs: add FAQ for "BigQuery Streaming Insert Not Allowed in Free Tier" error

docs/8. FAQ/Fixing BigQuery Streaming Insert Not Allowed in Free Tier Error.md

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+<h3>
+ <table>
+  <tr>
+    <td><b> 3 minutes read</b></td>
+    <td style={{ paddingLeft: '40px' }}><b>Level: Intermediate </b></td>
+    <td style={{ paddingLeft: '40px' }}><b>Last Updated: July 2026</b></td>
+  </tr>
+</table>
+</h3>
+
+# BigQuery Streaming Insert Not Allowed in Free Tier:
+
+Glific writes every message and contact update into your BigQuery account in real time, using what Google calls a "streaming insert". If your Google Cloud project's billing account is not fully set up, these writes fail and this error shows up in your BigQuery sync.
+
+## Why this happens:
+
+BigQuery has a generous free tier for storage and queries (refer [BigQuery Setup and link with Glific](https://glific.github.io/docs/docs/Product%20Features/Reporting%20&%20Dashboard/BigQuery%20Setup%20and%20link%20with%20Glific/) to know more), but streaming inserts are a separate, billable feature. Google requires a project to have an active, upgraded billing account before it will accept streaming inserts - even if your actual usage stays well within the free tier limits. This error usually means one of the following:
+
+- No billing account is linked to the Google Cloud project connected to Glific, or
+- The project is still on Google Cloud's 90-day free trial, which has not been upgraded to a full billing account.
+
+## How to fix this:
+
+1. Go to [Google Cloud Console](https://console.cloud.google.com/) and sign in with the account used to set up BigQuery for your organization.
+2. Select the same project that is linked to Glific for BigQuery (refer [BigQuery Setup and link with Glific](https://glific.github.io/docs/docs/Product%20Features/Reporting%20&%20Dashboard/BigQuery%20Setup%20and%20link%20with%20Glific/) if you're not sure which project this is).
+3. From the left navigation menu, select Billing.
+4. If you see an option to Upgrade, select it and complete the steps to convert your free trial to a full Cloud Billing account. If no billing account is linked at all, select Link a billing account and either choose an existing one or create a new one.
+5. Add a valid payment method when prompted, and confirm.
+
+Once billing is upgraded/linked, streaming inserts into BigQuery will resume automatically. You don't need to change anything in Glific - Glific will keep sending data as soon as your Google Cloud project accepts it.
+
+Please Note : Upgrading or linking a billing account does not mean you'll be charged immediately. BigQuery's free tier (10GB storage and 1TB of queries per month) still applies - you'll only be billed if you exceed those limits, and Google notifies you before that happens.