feat: Add Multichain API to Flask

.js.env.example

@@ -58,6 +58,9 @@ export METAMASK_ENVIRONMENT="local"
 # Build type: "main" or "flask" or "beta"
 export METAMASK_BUILD_TYPE="main"
 
+# Activates MultiChainAPI pipeline in the in-app browser.
+export MULTICHAIN_API="true"
+
 # Segment SDK proxy endpoint and write key
 export SEGMENT_WRITE_KEY=""
 export SEGMENT_PROXY_URL=""

app/core/AppConstants.ts

@@ -8,6 +8,7 @@ const PORTFOLIO_URL =
 const SECURITY_ALERTS_API_URL =
   process.env.SECURITY_ALERTS_API_URL ??
   'https://security-alerts.api.cx.metamask.io';
+const MULTICHAIN_API = process.env.MULTICHAIN_API || false;
 
 export default {
   IS_DEV: process.env?.NODE_ENV === DEVELOPMENT,
@@ -23,6 +24,7 @@ export default {
   SECURITY_ALERTS_API: {
     URL: SECURITY_ALERTS_API_URL,
   },
+  MULTICHAIN_API,
   PORTFOLIO: {
     URL: PORTFOLIO_URL,
   },