Wsrtjtyk

I'm attempting to create an App that exchanges information with an api (Questrade API to be precise). The api uses oauth2 for security and authentication.

I have been successful¹ in acquiring authorization tokens, refresh tokens and querying basic information (my account information and stock quotes).

However, I'm encountering an issue when I try to query stock option quotes (as described here).

I've tried many different permutations but to no avail. This is what I've done so far:

1). I've taken the example shown in the "Sample Request" section provided in the link above and performed jsondecode to get the MATLAB equivalent and the "exact template" for which the parameter structure must be coded:

>> eg_param = jsondecode('{"filters":{"optionType":"Call","underlyingId":27426,"expiryDate":"2017-01-20T00:00:00.000000-05:00","minstrikePrice":70,"maxstrikePrice":80},"optionIds":[9907637, 9907638]}')



eg_param =     

  struct with fields:    

      filters: [1×1 struct]

    optionIds: [2×1 double]



>> eg_param.filters    

ans =     

  struct with fields:    

        optionType: 'Call'

      underlyingId: 27426

        expiryDate: '2017-01-20T00:00:00.000000-05:00'

    minstrikePrice: 70

    maxstrikePrice: 80



>> eg_param.optionIds    

ans =    

     9907637

     9907638

2). Substituted my actual values (real_params) for those in the example:

real_params.optionIds = 23255262;

real_params.filters.optionType = 'Call';

real_params.filters.expiryDate ='2018-11-09T00:00:00.000000-05:00';

real_params.filters.underlyingId = 40825;

real_params.filters.minstrikePrice = ;

real_params.filters.maxstrikePrice = ;

3). Changed weboptions' RequestMethod paramater to post

web_opt.RequestMethod = 'Post';

4). Used the webwrite function, as opposed to 'webread' to post and query the server:

new_data = webwrite(['https://api01.iq.questrade.com/',...

 'v1/markets/quotes/options'], real_params, web_opt);

However, when I do this, is get the error message:

*The server returned the status 400 with

message "Bad Request" in response to the

request to URL

https://api01.iq.questrade.com/v1/markets/quotes/options.*

I've tried many different permutations including changing brackets, , {},{{}} and using different values for the parameters however the result is the same. Also, whenever I tested, I made sure to refresh the access token and test that the connection works using the "account info" request, so this error doesn't have to do with any authorization, security or connection issue.

¹ For example, to acquire account information, which the website instructs as:

GET https://api01.iq.questrade.com/v1/accounts

I've 1). used MATLAB's weboptions and created an object to store token information in HeaderFields:

web_opt = weboptions;

web_opt.RequestMethod = 'Get'; 

headerFields = {'Authorization', ['Bearer ', 'ZHHgMgh0up5UqJ9TSOIALpkoVpi0']};

web_opt.HeaderFields = headerFields;

and 2). queried the server using:

data = webread(['https://api01.iq.questrade.com/', 'v1/accounts'], web_opt);

And this accomplishes communication with the API server and MATLAB stores my account information as a structure array in the variable data.

Unfortunately I cannot test the solution since the API key you provided seems not to work, but it might help you anyway.

Can you spot the difference between the JSON produced using these two blocks?

% Original code:

real_params.optionIds = 23255262;

real_params.filters.optionType = 'Call';

real_params.filters.expiryDate ='2018-11-09T00:00:00.000000-05:00';

real_params.filters.underlyingId = 40825;

real_params.filters.minstrikePrice = ;

real_params.filters.maxstrikePrice = ;

%{

>> jsonencode(real_params)

ans =

    '{"optionIds":2.3255262E+7,"filters":{"optionType":"Call","expiryDate":"2018-11-09T00:00:00.000000-05:00","underlyingId":40825,"minstrikePrice":,"maxstrikePrice":}}'

%}

% Slightly modified code:

real_params = struct();

real_params.optionIds = int32(23255262);

real_params.filters.optionType = 'Call';

real_params.filters.expiryDate ='2018-11-09T00:00:00.000000-05:00';

real_params.filters.underlyingId = 40825;

real_params.filters.minstrikePrice = ;

real_params.filters.maxstrikePrice = ;    

%{

>> jsonencode(real_params)

ans =

    '{"optionIds":23255262,"filters":{"optionType":"Call","expiryDate":"2018-11-09T00:00:00.000000-05:00","underlyingId":40825,"minstrikePrice":,"maxstrikePrice":}}'

%}

It might be that the automatic conversion is the culprit in this case (which for a lack of better reason, sent your optionIds as a double value, and not the integer that the API expects.