Amazon say this:

'When you use all of the below tools to fulfil an order or alternatively set a 0- or 1-day handling time in combination with SSA and Buy Shipping, those orders will have no negative impact on your OTDR. You’ll still be expected to ship on time and meet the account level requirement on late dispatch rate.

• Automated handling time sets handling times at SKU level based on how long it usually takes you to process and hand over that product to carriers.
• Shipping Settings Automation (SSA) sets transit times based on up-to-date carrier delivery performance from your warehouse locations to different customer destinations.
• Buy Shipping helps you choose a shipping label for a service that can meet the Prime delivery promise to the customer.'

You're also fine if you ship fewer than 20 units within the 14 day window being measured.

What is your OTDR right now?