How to correctly generate a signature for a POST request?

Friends, please help me figure it out. In the description of the task there is an instruction how to edit some entry on the server. Here is the instruction:

To edit a task, you need to transfer to POST, in addition to the editable fields themselves, a special token (use the string "beejee" as the value of this field) and the additional parameter signature "signature".

To generate a signature you need:

1. collect all fields sent to POST, including token (except the field signature itself),
2. Only editable fields can be sent + token + signature
3. sort alphabetically all fields except token (the token field must be last),
4. perform URL encoding of request parameters (name parameters and parameter values), encoding is performed according to RFC 3986 standard (for example, the string "example@example.com" is encoded in "example% 40example.com")
5. collect sorted URL-encoded fields into one query string (params_string), the separator between the parameter name and its value is the symbol "=", between different parameters the symbol "&" (for example, status = 0 & text = SomeText & token = beejee). We remind you that the parameters must be encoded according to the standard RFC 3986,
6. calculate the md5 hash from the URL-encoded query string (md5 (params_string)) and send this md5 hash in the 'signature' field in POST along with other parameters

That's what did

function patchCard(id, newData) { const { text, status } = newData; const bodyWithoutSignature = "status=" + (status ? encodeURIComponent(statusReady) : encodeURIComponent(statusNotReady)) + "&text=" + encodeURIComponent(text) + "&token=" + encodeURIComponent(token); const md5Hash = md5(bodyWithoutSignature); const body = bodyWithoutSignature + "&signature=" + encodeURIComponent(md5Hash); const query = baseURL + "/edit/" + id; const requestOptions = { method: "POST", body: body }; return fetch(query, requestOptions).then(handleResponse); } 

From the server comes status OK, but nothing is being edited. Please help.

PS In the above code I am trying to change the text and status fields on the server