If the commission is paid to you (e.g. for you referring someone), then a sales invoice would be correct.
You may also find this topic useful:
http://community.quickfile.co.uk/t/how-to-bookkeep-for-affiliate-commissions/9977/2?u=qfsupport
If the commission is paid to you (e.g. for you referring someone), then a sales invoice would be correct.
You may also find this topic useful:
http://community.quickfile.co.uk/t/how-to-bookkeep-for-affiliate-commissions/9977/2?u=qfsupport