Dim MapDatos as Map
MapDatos=CreateMap("test":false,"language":"en","command":"GET_PAYMENT_METHODS","merchant":CreateMap("apiLogin":"tuapilogindata","apiKey":"tuapikey"))
Dim json As JSONGenerator
json.Initialize2(MapDatos)
'Luego pasas los datos por post como string
Dim JobApi as HttpJob
JobApi.Initialize("ApiPayu",Me)
JobApi.PostString("urldepayu",json.ToString)