In this new update, we've released a new option "Buy more words" which is applicable for all plans and at anytime that you want. So for now, you could easily choose any favorite package with a desired price and suitable words number and just it's up to your need.
At the left bottom screen, you could know how many words still are available in your plan and consider your need to choose and buy more words reasonably.
Click "Buy more words", you will see a scroll list like the below picture which shows you pricing corresponding to the number of translated words you want to get more.
Simply choose your favorite package then click on "Make payment" and you'll be redirected to the Shopify page to confirm and approve the one-time payment charge.
NOTE: This is one-time payment charge and it's charged separately with the monthly app charge.
Please refer to this link for more details about the one-time app charge in Shopify.
Hope this would be a great solution for your need.
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