In affiliate marketing, you can agree how long a partner remains eligible for payment after a visitor clicks and buys later. My old article called this the cookie period. I offered thirty or sixty days as examples of a fair balance between merchant and publisher. Neither figure is automatically fair for every product.
Explain attribution
A low-cost impulse purchase may happen the same day. An expensive service often takes longer to consider. Look at the real buying process. Write down when the period starts, what happens with multiple partners, returns and canceled orders, and when payment becomes final. A partner should understand the rules in advance.
Also ask whether you pay for additional customers or merely for the last click before a sale that was already likely. A longer period makes a program more attractive, but without clear terms it can cause disputes. Transparency matters more than one universal number of days.
Cookies are not just bookkeeping
My old description made it sound as if cookies could simply be placed unnoticed. Tracking is subject to privacy rules. The Dutch Data Protection Authority explains when consent is required. Check how your program handles consent, other attribution methods and data retention. A fair commission agreement only works when measurement itself is responsible.