Split Commission Between Two Users

We have collaborations between Affiliates and we need the option for them to be able to promote the collaboration and split the commission on the sales that are a result of the collaboration. Eg. AFF1 & AFF2 Collaborate and create some content that promotes PRODUCT - The fans of AFF1 and AFF2 are both watching and only the 1 coupon code is available to be used but as AFF1 & AFF2 are both responsible for the sale we need to be able to split the commission between them. I guess this could be done manually by tracking a unique coupon code but it would be good to be able to automate it.