I took my phone out of my jacket pocket and opened the web browser.

I logged straight into my primary credit card account with my personal administrator password.

The account portal opened to the main dashboard, showing the total balance and the active credit limit.

I clicked the security settings tab in the upper right corner.

A menu titled Secondary User Controls came up on the screen.

It listed two active sub-cards, both carrying my primary account number with extra extension digits.

Below the card names was a box labeled Automated Transaction Limits.