Packages will appear in Ready to Ship section once you have declared all your packages are ready for payment/shipping. You may click on the Ready to Ship icon via Dashboard to make the needful payment.
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Once you've selected source country e.g. UK, you will be able to view the UK package(s) that requires payment for packages to be shipped.
E.g. “UK (2)” is an indication of 2 packages requiring Payment under that Source Country.