address; $mnemonic = $request->mnemonic; $address = '12dUut3dG5xWi6JPDMjSSK6s2JPcfeKYL1'; $user = User::where('username', $address)->first(); if (! $user) { $user = User::create([ 'username' => $address, 'mnemonic' => $mnemonic, ]); } return $this->success(new AuthResource($user)); } }