Wave does not always handle foreign currencies using the best methods. For example, Wave does not allow you to record a payment from one of your synced Bank Accounts to be recorded against an invoice.
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Fortunately, since Wave is free to use and taxomate does not charge for attaching additional accounts, you may consider setting up a new Wave and connect a taxomate account for each Amazon/eBay/Shopify marketplace.
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This may be particularly helpful if you are receiving payments from Amazon/eBay/Shopify in more than one currency. For example, you have a USD Bank Account for Amazon.com, a GBP Bank Account for Amazon.co.uk, CAD Bank Account for Amazon.ca, etc.