ApiClient

ApiClient.java

public <T> T post(Object request, Class<T> responseType, Object... uriVariables) {

    HttpHeaders headers = new HttpHeaders();
    headers.set("X-Shopify-Access-Token", "<キー情報>");
    headers.set("Content-Type", "application/json");

    try{
        T response = restTemplate.postForObject("https://<shopifyホスト名>/admin/api/2020-10/graphql.json",
                new HttpEntity<>(request, headers),
                responseType,
                uriVariables);
        return response;
    } catch (HttpClientErrorException e) {
        throw e;
    }
}