Fix start.gg OAuth endpoints and document required client config

src/dashboard/scoreko-dev/views/Players.vue

@@ -425,7 +425,7 @@ onBeforeUnmount(() => {
             Integración start.gg
           </div>
           <div class="text-caption q-mb-md">
-            Conecta por OAuth (recomendado) o pega tu token personal para cargar tus torneos creados o donde eres admin.
+            Conecta por OAuth (recomendado) o pega tu token personal para cargar tus torneos creados o donde eres admin. Si aparece "Client authentication failed", revisa que en config uses el Client ID/Secret de un OAuth App de start.gg.
           </div>
           <div class="row q-col-gutter-sm items-center">
             <div class="col-12">

src/extension/startgg.ts

@@ -4,8 +4,8 @@ import { getData, type CountryRecord } from 'country-list';
 import { nodecg } from './util/nodecg.js';
 
 const STARTGG_ENDPOINT = 'https://api.start.gg/gql/alpha';
-const STARTGG_OAUTH_AUTHORIZE_ENDPOINT = 'https://start.gg/oauth/authorize';
-const STARTGG_OAUTH_TOKEN_ENDPOINT = 'https://api.start.gg/oauth/token';
+const STARTGG_OAUTH_AUTHORIZE_ENDPOINT = 'https://api.start.gg/oauth/authorize';
+const STARTGG_OAUTH_TOKEN_ENDPOINT = 'https://api.start.gg/oauth/access_token';
 const STARTGG_OAUTH_SCOPES = 'user.identity tournament.manager';
 const STARTGG_OAUTH_CALLBACK_PATH = '/startgg/callback';
 const STARTGG_OAUTH_DEFAULT_PORT = 34920;
@@ -168,18 +168,20 @@ const exchangeOAuthCodeForToken = async (
   redirectUri: string,
   oauthConfig: OAuthConfig,
 ): Promise<string> => {
+  const params = new URLSearchParams({
+    grant_type: 'authorization_code',
+    code,
+    client_id: oauthConfig.clientId,
+    client_secret: oauthConfig.clientSecret,
+    redirect_uri: redirectUri,
+  });
+
   const response = await fetch(STARTGG_OAUTH_TOKEN_ENDPOINT, {
     method: 'POST',
     headers: {
-      'Content-Type': 'application/json',
+      'Content-Type': 'application/x-www-form-urlencoded',
     },
-    body: JSON.stringify({
-      grant_type: 'authorization_code',
-      code,
-      client_id: oauthConfig.clientId,
-      client_secret: oauthConfig.clientSecret,
-      redirect_uri: redirectUri,
-    }),
+    body: params.toString(),
   });
 
   const payload = (await response.json()) as OAuthTokenResponse;
@@ -302,7 +304,7 @@ const ensureOAuthCallbackServer = async (oauthConfig: OAuthConfig) => {
 nodecg.listenFor('startgg:createOAuthSession', async (_payload: unknown, ack) => {
   const oauthConfig = getOAuthConfig();
   if (!oauthConfig) {
-    sendAck(ack, 'OAuth no está configurado en esta instalación (faltan startggClientId/startggClientSecret).');
+    sendAck(ack, 'OAuth no está configurado en esta instalación (faltan startggClientId/startggClientSecret). Usa el Client ID y Client Secret del OAuth app de start.gg.');
     return;
   }
 

src/types/schemas/configschema.d.ts

@@ -8,4 +8,16 @@
 
 export interface Configschema {
 	exampleProperty: string;
+	/**
+	 * Client ID de tu OAuth app de start.gg
+	 */
+	startggClientId?: string;
+	/**
+	 * Client Secret de tu OAuth app de start.gg
+	 */
+	startggClientSecret?: string;
+	/**
+	 * Puerto local para callback OAuth
+	 */
+	startggOAuthPort?: number;
 }