Seu sistema transmite ao eSocial. O resto é com a gente.

curl https://integration.enviaesocial.com.br/v1/events \
-H "Authorization: Bearer es_test_9fK2…" \
-H "Content-Type: application/json" \
-d '{
  "type": "S-2200",
  "employer_document": "12.345.678/0001-95",
  "layout": "S-1.3",
  "client_reference": "admissao-0042",
  "data": {
    "indretif": 1,
    "cpftrab": "41872634036",
    "nmtrab": "Mariana Alves Peixoto",
    "sexo": "F",
    "racacor": 1,
    "grauinstr": "09",
    "dtnascto": "1994-03-12",
    "paisnascto": "105",
    "paisnac": "105",
    "endereco": {
      "brasil": {
        "dsclograd": "Avenida Paulista",
        "nrlograd": "1000",
        "cep": "01310100",
        "codmunic": "3550308",
        "uf": "SP"
      }
    },
    "vinculo": {
      "matricula": "0042",
      "tpregtrab": 1,
      "tpregprev": 1,
      "cadini": "N",
      "infocontrato": { "codcateg": 101 }
    }
  }
}'

$curl = new Curl();
$curl->setHeader('Authorization', 'Bearer es_test_9fK2…');
$curl->setHeader('Content-Type', 'application/json');
$curl->post('https://integration.enviaesocial.com.br/v1/events', [
  'type'              => 'S-2200',
  'employer_document' => '12.345.678/0001-95',
  'layout'            => 'S-1.3',
  'client_reference'  => 'admissao-0042',
  'data'              => [
      'indretif'   => 1,
      'cpftrab'    => '41872634036',
      'nmtrab'     => 'Mariana Alves Peixoto',
      'sexo'       => 'F',
      'racacor'    => 1,
      'grauinstr'  => '09',
      'dtnascto'   => '1994-03-12',
      'paisnascto' => '105',
      'paisnac'    => '105',
      'endereco'   => ['brasil' => [
          'dsclograd' => 'Avenida Paulista', 'nrlograd' => '1000',
          'cep' => '01310100', 'codmunic' => '3550308', 'uf' => 'SP',
      ]],
      'vinculo'    => [
          'matricula' => '0042', 'tpregtrab' => 1, 'tpregprev' => 1,
          'cadini' => 'N', 'infocontrato' => ['codcateg' => 101],
      ],
  ],
]);

$evento = $curl->response->data->event;   // 202: o evento (uuid, status VALIDATED)

const admissao = {
  indretif: 1, cpftrab: '41872634036', nmtrab: 'Mariana Alves Peixoto',
  sexo: 'F', racacor: 1, grauinstr: '09', dtnascto: '1994-03-12',
  paisnascto: '105', paisnac: '105',
  endereco: { brasil: { dsclograd: 'Avenida Paulista', nrlograd: '1000', cep: '01310100', codmunic: '3550308', uf: 'SP' } },
  vinculo: { matricula: '0042', tpregtrab: 1, tpregprev: 1, cadini: 'N', infocontrato: { codcateg: 101 } },
};

const resposta = await fetch('https://integration.enviaesocial.com.br/v1/events', {
  method: 'POST',
  headers: {
    Authorization: 'Bearer es_test_9fK2…',
    'Content-Type': 'application/json',
  },
  body: JSON.stringify({
    type: 'S-2200',
    employer_document: '12.345.678/0001-95',
    layout: 'S-1.3',
    client_reference: 'admissao-0042',
    data: admissao,
  }),
});

const { data: { event: evento } } = await resposta.json();   // 202: o evento (uuid, status VALIDATED)

import requests

admissao = {
  "indretif": 1, "cpftrab": "41872634036", "nmtrab": "Mariana Alves Peixoto",
  "sexo": "F", "racacor": 1, "grauinstr": "09", "dtnascto": "1994-03-12",
  "paisnascto": "105", "paisnac": "105",
  "endereco": {"brasil": {"dsclograd": "Avenida Paulista", "nrlograd": "1000", "cep": "01310100", "codmunic": "3550308", "uf": "SP"}},
  "vinculo": {"matricula": "0042", "tpregtrab": 1, "tpregprev": 1, "cadini": "N", "infocontrato": {"codcateg": 101}},
}

resposta = requests.post(
  "https://integration.enviaesocial.com.br/v1/events",
  headers={"Authorization": "Bearer es_test_9fK2…"},
  json={
      "type": "S-2200",
      "employer_document": "12.345.678/0001-95",
      "layout": "S-1.3",
      "client_reference": "admissao-0042",
      "data": admissao,
  },
)

evento = resposta.json()["data"]["event"]   # 202: o evento (uuid, status VALIDATED)

var http = new HttpClient();
http.DefaultRequestHeaders.Authorization = new AuthenticationHeaderValue("Bearer", "es_test_9fK2…");

var evento = new {
  type = "S-2200",
  employer_document = "12.345.678/0001-95",
  layout = "S-1.3",
  client_reference = "admissao-0042",
  data = new {
      indretif = 1, cpftrab = "41872634036", nmtrab = "Mariana Alves Peixoto",
      sexo = "F", racacor = 1, grauinstr = "09", dtnascto = "1994-03-12",
      paisnascto = "105", paisnac = "105",
      endereco = new { brasil = new { dsclograd = "Avenida Paulista", nrlograd = "1000", cep = "01310100", codmunic = "3550308", uf = "SP" } },
      vinculo = new { matricula = "0042", tpregtrab = 1, tpregprev = 1, cadini = "N", infocontrato = new { codcateg = 101 } }
  }
};

var resposta = await http.PostAsJsonAsync("https://integration.enviaesocial.com.br/v1/events", evento);
var corpo = await resposta.Content.ReadAsStringAsync();   // 202: {"data": {"event": {"uuid": …, "status": "VALIDATED"}}}