Why can't I purchase the Theme Updater for the Turbo theme?

[swingrays]

I'm  trying to purchase Theme Updater  for the TURBO theme for my client who's store I'm creating, which is in currently in development mode.  Shopify asked me to type in a credit card to use, I did, and I get an error when I click the APPROVE button.  Now, I can't find where to double check the credit card info.  It still must think there's a credit card because the Approve button is still clkickable, but still gives me the error. 

Please check my store to find why I can't make this purchase.  I tried going to Out of the Sandbox and they are sending me back to Shopify.   

[Sophia]

Hi, @swingrays!

Without revealing any details about your card, are you able to share what the error message said? That can help us determine next steps.

If the error is stating that there's an issue with the payment method, you should be able to update your billing information under Finances > Billing or Settings > Billing.

For security reasons, our team cannot access your account details from the Community, but you can get in touch via live chat, email, or callback in the Shopify Help Center if you require further assistance with this. We're happy to help any time.