How do I process payroll when people are paid a retainer to be reimbursed when they earn a commission? Help? -

How do I process payroll when people are paid a retainer to be reimbursed when they earn a commission? Help?I am bookkeeping for a travel agent (my first one) and am wondering on the best way to process payroll in MYOB when the sales staff are paid a wage (retainer I suppose) each week which is to be paid back when they sell a house and earn their commission. Would you do an advance? There must be a better way. Any advice much appreciated.

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