How can I change the 'Free' shipping label in ShopPay?

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I have changed the language file in shopify for the word "Free" for shipping, as we require all purchases to contact us to determine the price of freight shipping. This has been working for us for the past 2 years. Recently there has seem to have been a change in the checkout verbiage.

We were still able to get it to work for the default checkout process, but when using ShopPay the verbiage remains as "Free" instead of the updated text we set in the Theme language options.