CHARGE_PRORATED_PRICE

Replacement takes effect immediately, and the billing cycle remains the same.

Example: This mode can be used because the Tier 2 subscription price per time unit ($36/year = $3/month) is greater than Tier 1 subscription price per time unit ($2/month). Samwise's Tier 1 subscription is immediately ended. Since he paid for a full month but used only half of it, half of a month's subscription ($1) is applied to his new subscription. However, since that new subscription costs $36/year, the remaining 15 days costs $1.50, so he is charged the difference of $0.50 for his new subscription. On May 1st, Samwise is charged $36 for his new subscription tier and another $36 on May 1 of each year following.