Multi-currency breaks discount code apps?

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As Shopify launches multi-currency for some of the stores we have one application that provides discount codes based on some conditions. 


Currently, we calculate cart_total_price and apply our conditions to generate a discount amount.

But in the Multi-currency store, it breaks all things as we currently depend only on store currency.
So is there any API to convert money or anything else so that we can solve this issue?