Checkout keeps stating that card information is invalid

[iggymrlh21]

So my website has been open for about 2 months now and I haven't gotten sales, so a family member tried to purchase an item and proceeded to checkout but one all information was entered and finalized they weren't able to purchase and it stated that card number and information was invalid even tho the information was correct, please help, im not sure why that's happening and possibly the reason I haven't been getting any sales 

[JJ_]

Hello @iggymrlh21

Firstly, welcome to the Seller Community + sorry to hear that you're here because you've run into trouble.

If you haven't already, your best bet is to get in touch with us directly, so that a member of our Square Online team can dig in with you. 

Please reach out directly by logging into your Square account and heading here when you have a moment.