formula
response['message'] = 'You will receive ' || (trigger.data.withdraw + trigger.output[[asset=base]]) - $return_fee || ' bytes to your account (' || trigger.data.withdraw || ' bytes from your account + '|| trigger.output[[asset=base]] || ' bytes bounced back - '|| $return_fee || ' bytes transaction fee)';
var[$balance_key] = var[$balance_key] - trigger.data.withdraw;
failed: not a decimal in -: You will receive 130000