If the merchant uninstalls the app during the first month after the trial period, then the second payment is not issued.
If the merchant downgrades or upgrades their plan during the first month after the trial period, then the commission for the second month will be based on the new monthly subscription fee.
During the billing month that happens change of plans, the commission will be based on the exact amount merchant is charged.
For example, if merchant is using Ali Reviews with plan A ($9) and decides to upgrade to plan B ($15) on the 15th day of the same billing month, you will receive $2.4 ($9*15/30*20% + $15*15/30*20%) for that month.
Your earning will be drawn up on Affiliate Dashboard at the end of each billing cycle.