Auto Checkout is the functionality that completes the checkout part of the order for you. It will display an animated rocket on top of the checkout screen for a few seconds.
If you would like to make changes on the address or delivery options you have the choice to click on "Cancel Auto Checkout and Take Control" to interrupt the automatic execution.
Auto Checkout starts when using Rocket Order or when clicking on the regular Order button. Clicking on the Shopping Cart button automatically disables the auto checkout.

On behavior settings you can enable/disable Auto Checkout in the "Checkout" section.
Below you can find solutions for some of the common issues that users can have during Auto Checkout
- Your checkout WILL be slower.
- If you do not have a payment method on file, checkout cannot be completed.
- If you are still seeing the Payment method error, go to the payment methods page on amazon and set another card as default and change it back to the card that you want to be your default card.
- Some users reported the checkout taking much longer than the other users. Verify if your default payment method is not some niche card that requires extra processing.
- To define your default address, change it on your Amazon account
- If it is still not being selected as default, open any product on amazon and click on the link showed on the picture below to chose your location

- If your business account is showing an extra page, on the bottom of the checkout page check the box "Use the selected group, shipping address, and payment method as my checkout defaults."