implement login

Signed-off-by: Loan Laux <loan@outgrow.io>

framework/reactioncommerce/utils/mutations/authenticate.ts

@@ -0,0 +1,15 @@
+const authenticateMutation = /* GraphQL */ `
+  mutation authenticate(
+    $serviceName: String!
+    $params: AuthenticateParamsInput!
+  ) {
+    authenticate(serviceName: $serviceName, params: $params) {
+      sessionId
+      tokens {
+        refreshToken
+        accessToken
+      }
+    }
+  }
+`
+export default authenticateMutation