How can I block purchases on Amazon Prime Video?

To block purchases on Amazon Prime Video, one must set up Amazon Video PIN. This can be done by navigating to the Prime Video settings on the Amazon website or through the Prime Video app. Once there, under the Parental Controls section, one has the option to create a five-digit PIN. It's important to remember this PIN, as it will be required for any future purchase or rental attempts on one's account across all devices connected to Amazon Prime Video. After creating and confirming the PIN, one can then adjust the Purchase Restrictions settings to require the PIN for purchases and rentals of videos. By doing this, unauthorized purchases on Amazon Prime Video can be effectively blocked.