I use Amazon as a logistical center - mean I sell at my Shopify store and once someone buys - I enter all the customers' details at the Amazon fulfillment center. The problem is it's taking me A LOT of time. Any suggestions which app can I use for this? Thank you so much!
Assuming you are using FBA, simply add the Amazon sales channel. After that, within settings --> Shipping you will be able to add Fulfillment by Amazon, and set any product to be automatically fulfilled by FBA.