function payment() {

    try {
      moduleA.show('Message in progress');
    } catch {
      try {
        moduleB.show('Message in progress');
      } catch {
        alert('Message in progress');
      }
    }

    transferMoney();

    try {
      moduleA.show('Message done');
    } catch {
      try {
        moduleB.show('Message done');
      } catch {
        alert('Message done');
      }
    }

}