Hi, and how may I help you?
Hi, I'm trying to make a purchase but my credit card keeps being rejected
Okay, I can help you with that.

Could you first try entering the information again and seeing if it works?
I have tried many times. It keeps saying my card is considered invalid. Can you tell me why?
It may be saying that because you need to log out and back in for security reasons, could you try that?
ok I've done that but it's still not working
The card is not expired, correct?
It's not, no
Okay, I can make the purchase for you on my end. I will need your credit card number and expiration date
ok sounds good I don't have my card with me right now I'll have to come back
Okay, is there anything else I can help with?
no thank you that's it I'll call back with my card, thanks!
have a good day!