Why am I facing errors when completing orders?

[Xfra]

 Hello there

Was testing my shop by attempting to purchase an item and unfortunately, I got this message. 
I am clueless, and where to fix it, honestly would appreciate some assistance: 

[Erin]

Hi, @Xfra. I'm happy to look into this with you! I just have a few questions to make sure I'm giving you accurate advice.

• Which plan is your store currently on? If you're unsure you can double check by going to Settings > Plan in your Shopify admin.
• Which payment provider or payment gateway are you testing?
• Are you testing payments in test mode of your payment gateway or payment provider? Or are you attempting this with a real payment?

Once I have more information I can share more advice on why you're seeing this. If you'd like to place a test order in the meantime you can do so by following the steps in this guide.

Please let me know if you have any questions!