[Python] Getting 500 error in python while trying to connect with API using exact same...

Hi i have below code written in python where i am trying to connect with Api using the exact same token , payload and headers as postman and send a create request same as i am doing in postman, in postman its working fine but in python its throwing HTTP error occurred:500 server error for url , response content is {timestamp, status:500, error: internal server error}

Below is my code in python i am not sure what to do in order to make it work i have tried exploring every option and every article on internet and also generated code using postman and modified it but was not successful- below code was generated in postman codegen and i have modified it but still its throwing errror, errors that i am facing i have given above-

import requests
import json

url = "http://localhost:8080/apim/execute/repayments/v3/dummy-acceptance"

payload = {
"customer": {
"id": "cust00001",
"name": {
"first_name": "Matthew",
"last_name": "Peterson"
},
"email": "matthew@gmail.com"
},
"method": {
"type": "FPS"
},
"transaction": {
"id": "dummy456721094299",
"amount": 62.08,
"currency_code": "GBP",
"country_code": "GB",
"url": {
"accepted": "http://accepted.com",
"declined": "http://declined.com"
},
"reason": "Purchased goods",
"reference": "ref_0974299",
"product_info": [
{
"id": "prod00007",
"name": "Apple Laptop",
"quantity": 1,
"amount": 62.08,
"description": "Laptop Purchased"
}
],

"expiry_time": 1000
}
}

headers = {
"Idempotency-Id": "12456478591",
"Content-Type": "application/json",
"Merchant-Id": "dummyuEFPS2409",
"Authorization": "Bearer eyJ0eXAiOiJKV1QMFB231pUMg1jHfU2SaDfRj2b_QJoPydIzXfsPlmSEGMzjRUDI",
"Operation": "AUTHORIZE"
}

try:
response = requests.post(url, headers=headers, data=json.dumps(payload))
response.raise_for_status() # Raise an exception for HTTP errors
print("success", response.json())

except requests.exceptions.HTTPError as errh:
print("HTTP error occurred:", errh)
print("Response content:", response.text)
except requests.exceptions.ConnectionError as errc:
print("Error Connecting:", errc)
except requests.exceptions.Timeout as errt:
print("Timeout Error:", errt)
except requests.exceptions.RequestException as err:
print("An error occurred:", err)

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