Invalid Value passed for JSONString when using Crea invoice api

Invalid Value passed for JSONString when using Crea invoice api

Hi There,

I'm very new to using api's, but I wanted to test creating an invoice, I'm using Postman and as you will see from the screenshot attached I get an error, I don't see any issue with the code and the header is just  "Content-Type:application/json".

Could somebody please help me understand and overcome this issue?

Many Thanks,

Mike

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