Initiate USSD-PUSH request

curl --request POST \
  --url https://api.clickpesa.com/third-parties/payments/initiate-ussd-push-request \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '{
  "amount": "<string>",
  "currency": "TZS",
  "orderReference": "<string>",
  "phoneNumber": "<string>",
  "checksum": "<string>"
}'

{
  "id": "<string>",
  "status": "PROCESSING",
  "channel": "<string>",
  "orderReference": "<string>",
  "collectedAmount": "<string>",
  "collectedCurrency": "<string>",
  "createdAt": "2023-11-07T05:31:56Z"
}