set bii=$p(pStreamIn.GetAttribute("content-type"),"=",2)
	set message=##class(%Net.MIMEPart).%New()
	set reader=##class(%Net.MIMEReader).%New()
	Do reader.OpenStream(pStreamIn)
	set a=0while a'=1
	{
		Set sc=reader.readHeader(.message,1)
	    Set sc=reader.readBody(message,bii,.a)
	    $$$LOGINFO(message.GetHeader("Content-Type"))
	    $$$LOGINFO($p(message.GetHeader("Content-Disposition"),"""",2))
	    $$$LOGINFO(message.Body.Read())
	}

HI 

 I think the score for IPM needs to be added to fhirmessageverification

Is Your class extend % CSP.REST? OR extend EnsLib.REST. Service?

Does your ESBCHUIMI client class have the following code？

    try this

   call %Library.Global_Get('%SYS','^xxxx')

The jwt on the second image you provided seems to be also an incorrect verification

I think your modified jwt is the correct one (also requires base64url encoding, no final=)

HI,

Perhaps the following methods can be considered

w ##class(%SYSTEM.Util).CreateGUID()

w $system.Encryption.GenCryptToken()

w  $system.Encryption.GenCryptRand(20,0)

 w $system.Encryption.Base64Encode($system.Encryption.GenCryptRand(20,0),1)

Try this