I did something analogous?/similar-ish recently. I tried to pay my parents' credit card balance (let's say it was $1000). I went through the process and recei

I did something analogous?/similar-ish recently. I tried to pay my parents' credit card balance (let's say it was $1000). I went through the process and received an automated email saying, "Thank you for paying $1000 on the credit card." Got a call from my father a few hours later telling me he spent another $300 and could I please pay the extra $300...? So, I signed in again and paid another $300. Only thing is, unbeknownst to me, the $300 payment canceled the $1000 payment -- because they both were scheduled for the same day. I only found out when I signed in a few weeks later and saw a $40 interest charge for not paying the full balance on the credit card. <grumble>... Definitely my fault for not paying closer attention, but still annoying.