PowerChat: re-home minted intent links onto the configured PowerChat base URL

ddiff --git a/server/integrations/powerchat-checkout.js b/server/integrations/powerchat-checkout.js
iindex 9e8f5faf..40969846 100644
---- a/server/integrations/powerchat-checkout.js
++++ b/server/integrations/powerchat-checkout.js
@@@ -125,7 +125,15 @@ async function mintCheckoutLink(pcUsername, ref, { purpose = null, amountCents =
          const json = await oauth.apiRequest(conn.user_id, { method: 'GET', path: '/tip-checkout-link', username: pcUsername, query });
          const url = (json && json.data && json.data.url) || (json && json.url) || null;
          if (!url || !/^https?:\/\//i.test(String(url))) throw new Error('response carried no url');
--        return String(url);
++        // PowerChat builds the link on ITS configured public host. When we talk to it
++        // through a different hostname (dev instance behind a tunnel), viewers can only
++        // reach the one we're configured with — the intent token is what matters, so
++        // re-home the link onto our baseUrl and keep path + query intact.
++        try {
++            const u = new URL(String(url)), b = new URL(oauth.getConfig().baseUrl);
++            if (u.host !== b.host) { u.protocol = b.protocol; u.host = b.host; }
++            return u.toString();
++        } catch { return String(url); }
      };
      try {
          return { url: await attempt(true), minted: true };