How does cdf get its own invitation code?

How can cdf get its own invitation code? The methods are as follows:

Step 1, V search CDF members to buy applets.

step 2: enter the personal center and click login.

Step 3: Enter the mobile phone number for personal ID card to obtain the verification code, and enter the invitation code as shown below.

the fourth step is to improve personal real information, which needs to be true.

CDF members purchase invitation codes and strategies, which can be updated at any time. While everyone is still running around duty-free shops, a small program CDF has quietly sprung up. You don't need to take a photo, you can register yourself as a member with a small invitation code.