Insert rows in an empty data extension on salesforce marketing cloud by using API call

Question

I didn't achieve to receive data in my data extension (empty) by using the API multiple data extension rows method.

I created a data extension with 7 variables (6 data type = text, 1 is a date). One of the 7 variables is a primary key (text data type).

On postman, I created a first POST request:

1. URL: https://mc08wx0hkc21mnr8g402m7q36hy4.auth.marketingcloudapis.com/v2/token

2. In the body:

   { 
       "client_id": " ", 
       "client_secret": " ", 
       "account_id": " ", 
       "grant_type": " " 
   } 
   

With all the information about the package that I created on marketing cloud and that I have to use:

(scope : data extension => read, write)

By sending this request, I got my access_token.

The second part is more confused for me, I have to make the connection so as to populate my data extension.

I created a second POST request:

1. In the body:

   Host : https://MY_SUBDOMAIN.rest.marketingcloudapis.com
   POST /hub/v1/dataevents/key: ID DataExtension/rowset
   Content-Type: application/json
   Authorization: Bearer eyJhY2Nlc...
   

The part with the URL is more confused for me. As I said before, I have one primary key in the data extension that I created to receive the datas

2. URL: https://mc08wx0hkc21mnr8g402m7q36hy4.rest.marketingcloudapis.com/ POST /hub/v1/dataevents/key: EXTERNAL_KEY_OF_MY_DATA_EXTENSION/keys :MY_PRIMARY_KEY_NAME/

I followed the Salesforce docs.

By sending the request, I had:

<h1>596 Service Not Found</h1>