Unfortunately, there is no documentation other than the code itself. There is no sandbox other than what you build. Look in interface/orders. This is where most of the hl7 live.
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Yes I have written one channel with Mirthconnect import data into OpenEMR using the WebPT application. WebPT use to send the procedure (HL7 DFT) file into Mirth connect server and I have written one channel to import data into OpenEMR. Written channel into JavaScript and provided template as well to get the data.