For OFMs, the payment for the full item value should be sent before we process your request. The OFM service fees, delivery fees, etc., will be charged upon package arrival and have to be paid in order for your package to be shipped out. You can complete the payment for said fees any time after package arrival. If not, you can wait until you request for shipping, and the invoice will include all pending charges.
For unboxing, inclusion, consolidation fees, etc., you will be charged once the processing is finished. You can pay at any time via My account - My charges, or you can wait until you request for shipping, and the invoice will include all pending charges.