In the meantime I'd suggest something that I always suggest storeowners think about ...
Instead of going for just-in-time quotes, why not give some thought to the kinds of shipments you'll be making and see whether perhaps a "table rate" might work, such as flat-rate pricing up to a certain qty or weight, and then another until the next qty or weight level, etc.
Having that worked out not only gives you a bridge until getting a CP thing working, but also gives you a fallback if you ever need it if CP's services go down for some reason.
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