On the Invoice Payment Page, you may select the kind of payment you want to make/take for the invoice - "Full Payment" or "Part Payment" (depending on the amount available in the wallet, and what you want to do).\
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Note that additional funds may also be added to the wallet at this point, if need be, by simply making a transfer into the wallet's account.\
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Finally, Click the "**Proceed**" button to proceed with the actual payment collection.