Can I please double check this sequence with you all. At savannakhet you submit online application for the visa first. then pay the fee at the consulate the following day. right? will I be able to pay the day after I submit if I submit it on a holiday?

Just finished my application for my Non O with the London embassy as I do every year , got to the payment part and all ok now they used to send you a Bar code after completing the online application but this time it just said payment completed send passport , Has anyone else had this ? Don’t won’t to send my passport if it requires the Barcode many thanks