TOSHL Finance API Power BI - POST entries

TOSHL_API_POST_Entries.m

/* POST TOSHL.com transaction in Power BI Power Query 
https://developer.toshl.com/docs/entries/create/ 

all KEYS & IDs stored as parameters 
*/ 
let
	Source = Json.Document(
		Web.Contents(
			"https://api.toshl.com/entries", 
			[
				Headers = [#"Content-Type" = "application/json", accept = "application/json", Authorization
					= "Bearer " & TOSHLAPIKEY], 
				// POST content
				Content = Json.FromValue(
					[
						amount = "-30", 
						account = TOSHLACCOUNT, 
						currency = [code = "EUR"], 
						date = "2020-05-25", 
						category = "64130375"
					]
				)
			]
		)
	)
in
	Source
  
/* IMPORTANT NOTICE: 
    transactions gets created in TOSHL, but error is returned in Power Query 
     >> DataFormat.Error: We reached the end of the buffer. 
     
  Work in progress... 
*/