Bol Retailer API: Exporting Offer File using Python and API Version 9

I am not able to export an Offers File when I try to fetch it via Python Code. I am trying to use the Bol. com API V9 and request a list of all offers.

headers = {
    'Accept': 'application/vnd.retailer.V9+json',
    "Content-Type": 'application/vnd.retailer.V9+json',
    "Authorization": "Bearer " + f"{access_token}"
}
params = {
    "format": "CSV",
}

url = "https://api.bol.com/retailer/offers/export"
response = requests.post(url, headers=headers, params=params)

Do you have an idea what I am missing out? Or is their API just buggy at this point?
The POST Call gives me a result which looks like that:

Status-Code: 400
{
"type" : "https://api.bol.com/problems",
"title" : "Bad Request",
"status" : 400,
"detail" : "The supplied accept header media type is not supported.",
"host" : "Instance-106",
"instance" : "https://api.bol.com/retailer/offers/export?format=CSV"
}

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IMO the "Accept" Header looks absolutely fine according to their documentation.

>Solution :

Based on their documentation (found here) the server accepts data in Json format. So the correct code should look like:

headers = {
    'Accept': 'application/vnd.retailer.V9+json',
    "Content-Type": 'application/vnd.retailer.V9+json',
    "Authorization": "Bearer " + f"{access_token}"
}
params = {
    "format": "CSV",
}

url = "https://api.bol.com/retailer/offers/export"
response = requests.post(url, headers=headers, json=params)  # <-- note the json= parameter