First of all, you need to have an Amazon Business account on Amazon. 
You need to create a Punchin group within your Amazon Business account:

Setup your Purchasing system. 
Save these credentials to a spreadsheet. Then, send these credentials to your customer success manager.
*here, you can copy a spreadsheet template and fill it in.

Now the settings are done from your side. Next, Amazon and Precoro's team will set up a connection. 

It takes one day. Once done, you can test a connection between Amazon and Precoro.
Please note that your accounts are in test mode. All of the Orders approved will be canceled on Amazon in the test mode.

Once done with testing, you can switch to active mode