curl --request POST \
  --url https://omnicommerce.sg/api/v1/oauth/token \
  --header 'Content-Type: application/x-www-form-urlencoded' \
  --data grant_type=client_credentials \
  --data 'client_id=<string>' \
  --data 'client_secret=<string>'

const options = {
  method: 'POST',
  headers: {'Content-Type': 'application/x-www-form-urlencoded'},
  body: new URLSearchParams({
    grant_type: 'client_credentials',
    client_id: '<string>',
    client_secret: '<string>'
  })
};

fetch('https://omnicommerce.sg/api/v1/oauth/token', options)
  .then(res => res.json())
  .then(res => console.log(res))
  .catch(err => console.error(err));

import requests

url = "https://omnicommerce.sg/api/v1/oauth/token"

payload = {
    "grant_type": "client_credentials",
    "client_id": "<string>",
    "client_secret": "<string>"
}
headers = {"Content-Type": "application/x-www-form-urlencoded"}

response = requests.post(url, data=payload, headers=headers)

print(response.text)

{
  "access_token": "<access_token>",
  "token_type": "Bearer",
  "expires_in": 3600
}

{
  "error": "<string>",
  "error_description": "<string>"
}

{
  "error": "invalid_client",
  "error_description": "<string>"
}