If you're having some issues paying through Shopify and the option doesn't appear as payment method, don't worry! 🙌
Verify that your Plan has expired or that you effectively ran out of shipments.
In fact, Shopify payment method won't be available unless these two conditions are respected.
What you can do if your plan is still on-going is to upgrade your current plan by entering the average number of orders to add to the rest of the month or the year, accordingly to the lenght of your plan, from Admin > Plans.
📌You'll only be charged of the new orders purchased, so make sure to include the current amount included in your plan + the new ones.