POST调用实际上是否使用HTTP客户端（如Postman或Insomnia）工作？
我注意到你传递了一个$options数组，并将其嵌套在Guzzle选项中。

$this->client->request('POST', $uri, [
   ['headers' => '...', 'body' => ['...']],
   'headers' => ['...']
]);

这行不通，您需要按照以下方式打开 Package ：

public function post($uri, array $options = []) {
   $this->authenticate();
   return $this->client->request('POST', $uri, [
       ...$options, 
       'headers' => [
           'Authorization' => 'Bearer '.$this->access_token,
       ],
   ]);
}

请注意...这个点，它是用来解压缩options数组的，还要注意，headers键设置了两次（一次在post方法定义中，一次在options参数中），所以实际上只使用了一次（顺便问一下，为什么要使用X-HTTP-Method-Override头文件？）
如果您想在POST函数参数中传递所有头和体，另一个解决方案是：

public function post($uri, array $options = []) {
   $this->authenticate();
   return $this->client->request('POST', $uri, [
       'json' => $options['json'], // I would suggest 'json' because it looks like the API is looking for a JSON body, if that doesn't work go with 'body' 
       'headers' => [
           'Authorization' => 'Bearer '.$this->access_token,
           ...$options['headers']
       ],
   ]);
}

如果这样做不起作用，您可以尝试另一种方法，即使用Guzzle json选项而不是body来处理POST请求。

当您在探索任何AmadeusSelfServiceAPI时，我建议您查看门户，因为它将帮助您了解如何进行http调用。
在您的情况下：https://developers.amadeus.com/self-service/category/air/api-doc/flight-offers-search/api-reference
另一个帮助可能是查看编码示例：

• https://github.com/amadeus4dev/amadeus-code-examples/blob/master/flight_offers_search/v2/post/curl/
• https://github.com/amadeus4dev/amadeus-code-examples/tree/master/flight_offers_search/v2/get/curl

也许有点晚了，但这个例子对我很有效：

$options = [
        'headers' => [
            'Authorization' => sprintf('Bearer %s', $this->getApiToken()),
            'content-type'        => 'application/vnd.amadeus+json',
            'X-HTTP-Method-Override' => 'GET',
        ],
        'body' => '{
                "currencyCode": "XPF",
                "originDestinations": [
                    {
                                  "id": 1,
                        "originLocationCode": "PPT",
                        "originRadius": null,
                        "alternativeOriginsCodes": [],
                        "destinationLocationCode": "CDG",
                        "alternativeDestinationsCodes": [],
                        "departureDateTimeRange": {
                            "date": "2022-12-22",
                            "dateWindow": "I2D"
                        },
                        "includedConnectionPoints": [],
                        "excludedConnectionPoints": []
                    }
                ],
                "travelers": [
                    {
                        "id": "1",
                        "travelerType": "ADULT",
                        "associatedAdultId": null
                    }
                ],
                "sources": [
                    "GDS"
                ]
            }'
    ];

    try {
    ...
        $response = $this->httpClient->post(self::AMADEUS_API_URL_FLIGHT_OFFER, $options);

        $body = $response->getBody();
        ...

注意：不要忘记内容类型，它不是很明显，在第一眼看到的文档，但没有它不工作与Guzzle对我来说（但与失眠没有问题）
类的常量：

private const AMADEUS_API_CLIENT_GRANT_TYPE = 'client_credentials';

private const AMADEUS_API_URL_AUTH = '/v1/security/oauth2/token';

private const AMADEUS_API_URL_FLIGHT_OFFER = '/v2/shopping/flight-offers';

身份验证：

/**
     *
     */
    public function authenticate()
    {
        if (!is_null($this->getApiToken())) {
            return $this->getApiToken();
        }

        $options = [
            'form_params' => [
                'client_id' => $this->apiId, //setted in the parent construct
                'client_secret' => $this->apiKey, //setted in the parent construct
                'grant_type' => self::AMADEUS_API_CLIENT_GRANT_TYPE,
            ]
        ];

        try {

            $response = $this->httpClient->post(self::AMADEUS_API_URL_AUTH, $options);
        } catch (ClientExceptionInterface $exception) {
            ...
        }

        if ($response->getStatusCode() != Response::HTTP_OK) {
            
            throw new ApiException($errorMessage, [$response->getReasonPhrase()], $response->getStatusCode());
        }

        $body = $response->getBody();
        //custom serializer, AmadeusAuthenticationResponse is a mapping based on Amadeus authentication response
        $authenticationResponse = $this->serializer->convertSerializationToData($body->getContents(), AmadeusAuthenticationResponse::class);

        $this->setApiToken($authenticationResponse->getAccessToken());

        return $this->getApiToken();
    }';