emitirNotaFiscalComplementar_Imposto.cs

var client = new RestClient("https://webmaniabr.com/api/1/nfe/complementar/");
var request = new RestRequest(Method.POST);
request.AddHeader("x-access-token-secret", "SEU_ACCESS_TOKEN_SECRET");
request.AddHeader("x-access-token", "SEU_ACCESS_TOKEN");
request.AddHeader("x-consumer-secret", "SEU_CONSUMER_SECRET");
request.AddHeader("x-consumer-key", "SEU_CONSUMER_KEY");
request.AddHeader("content-type", "application/json");
request.AddHeader("cache-control", "no-cache");

request.AddParameter("undefined", "{\n    \"nfe_referenciada\": \"00000000000000000000000000000000000000000000\",\n    \"operacao\": 1,\n    \"natureza_operacao\": \"Natureza da operação\",\n    \"ambiente\": 2,\n    \"cliente\": {\n        \"cpf\": \"000.000.000-00\",\n        \"nome_completo\": \"Nome completo\",\n        \"endereco\": \"Av. Brg. Faria Lima\",\n        \"complemento\": \"Escritorio\",\n        \"numero\": 1000,\n        \"bairro\": \"Itaim Bibi\",\n        \"cidade\": \"São Paulo\",\n        \"uf\": \"SP\",\n        \"cep\": \"00000-000\",\n        \"telefone\": \"(00) 0000-0000\",\n        \"email\": \"nome@email.com\"\n    },\n    \"produtos\": [\n        {\n            \"nome\": \"Nome do produto\",\n            \"codigo\": \"nome-do-produto\",\n            \"ncm\": \"6109.10.00\",\n            \"cest\": \"28.038.00\",\n            \"quantidade\": 1,\n            \"unidade\": \"UN\",\n            \"peso\": \"0.500\",\n            \"origem\": 0,\n            \"subtotal\": \"29.90\",\n            \"total\": \"29.90\",\n            \"tributos_federais\": \"10.00\",\n            \"tributos_estaduais\": \"10.00\",\n            \"impostos\": {\n                \"icms\": {\n                    \"codigo_cfop\": \"6.102\",\n                    \"situacao_tributaria\": \"102\"\n                },\n                \"ipi\": {\n                    \"situacao_tributaria\": \"99\",\n                    \"codigo_enquadramento\": \"999\",\n                    \"aliquota\": \"0.00\"\n                },\n                \"pis\": {\n                    \"situacao_tributaria\": \"99\",\n                    \"aliquota\": \"0.00\"\n                },\n                \"cofins\": {\n                    \"situacao_tributaria\": \"99\",\n                    \"aliquota\": \"0.00\"\n                }\n            }\n        }\n    ]\n}", ParameterType.RequestBody);
IRestResponse response = client.Execute(request);