The business card is blank because the code doesn't set the "person" it should display. That's the next step.

由于代码没有设置名片应该显示的“人员”信息，因此名片此时是空白的。

youdao

Set as follows: 1, set the lock code with the installation of card 2, set the lock time with a clock card.

设置过程如下：1、用安装卡设置门锁编号；2、用时钟卡设置门锁时间。

youdao

But you may authorise any company with a Visa code, anywhere in the world, to set up a continuous payment from your credit card.

BBC: Warning over credit trap