Build or set up an integration for Amazon Seller Central and Wave

Hello, I need help with building or setting up an integration for Amazon Seller Central and Wave. I don't want to pay for monthly recurring services. It would be best if there is a free tool that I can use. If not, I would like to develop something for my personal use. I don't care about which language is used for developing as long as it is easy to use and doesn't give me problems in the long run. I use g suite and not Microsoft. I only use OneDrive by Microsoft.