Hey, @sarosa. Welcome to the Community!
Thanks for including a screenshot in your post; it's really helpful to help troubleshoot this for you. In order to process an order through your store, even if it is for testing purposes, you’ll need to have a payment gateway activated on your account. You can read more about this in the Help Doc for Payments.
Do you have an idea of what type of payment method you would like to use on your store?
Take a look here for the payment gateways available to merchants in Morocco. Once you’ve decided which one you’d like to use, please set up an account directly with the provider, then follow the steps in the Help Doc for configuring third party providers to connect it to your store. As soon as a payment method is enabled you will then be able to process a payment for your Printful product through your Shopify checkout.
Let me know if you continue to have any issues with this. I’m here to help.
Hi again, @sarosa! Thanks for following up.
If Paypal is showing as connected when you go to ‘Settings > Payments’ as seen below, and you are still receiving that error message at the checkout, then this is definitely unusual behaviour. Therefore, I’d like to take a direct look at your store to first determine if the issue is within Shopify or Paypal, so that we know how to proceed towards fixing it. I’m sending you an email to facilitate this. Please keep an eye out for it!