Passing values to construct a POST request body, in custom source connectors

I am developing a custom source connector that is supposed to send a POST request to an API, receive the response from this API, and store the response in the destination which is an AWS S3 bucket.

The HTTP POST header requires accountid and servicekey. Hence, I add the following fields to spec.yaml:

    - accountid
    - servicekey

I include these two values in the config.json file.

However, the HTTP POST body also requires two fields which are DocumentAsBase64String and DocumentLastModified.

In my connector class, I include a request_body_json() method that is supposed to read DocumentAsBase64String and DocumentLastModified from outside of the connector’s Docker container (e.g. from file or from another API). How should I do this?

In particular, how should I pass these two values to the connector and subsequently to request_body_json() method?

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