Recently, when I was handling business at the post office, I found that many of the clerks had never processed this type of transaction before. They needed to input a transaction code in order to complete it (I was told that the system didn't recognize the name of the service or that it simply didn't exist – apparently due to lack of authorization).
This led to the idea...
Below is the question (don't forget to vote at the end, as it will be used separately from the standard form).
1. Select shipping service [Select]
Perform a rough categorization of the business, and apply the post-tagged transaction code.
The next two are International Regular Mail and International Registered Mail.

2. Enter the transaction code (with an image)
Please enter the business transaction code.
The illustrations are quite basic, and can be further subdivided (by port, foreign port, international, Hong Kong, Macao, Taiwan, post office, etc.).

3. Enter transaction code (no image)
2. Removed images to test the ability of the partner site to use search engines.

This is just a rough classification; typical transaction codes are 3 digits long, while standard transaction codes are 6 digits long.

It seems like there aren't many people actively researching parcel delivery systems anymore.😟
To reiterate, entertainment, very use form.