curl --location --request POST 'https://sandbox.paypoint.blackkonnect.io/services/blackkonnectpaypointswitch/api/bill-payments/bill-subscription/cancellation' \
--header 'X-Request-ID: 3d8f0c44-d4c7-4c7b-8a67-78e34b4d947e' \
--header 'X-ServiceAccount-ID: 0e92f7e6-8b2a-11ec-b909-0242ac120002' \
--header 'X-Organisation-ID: d321b5af-6e4b-4e47-87d2-7f7eabc84c5f' \
--header 'Idempotency-Key: d7f7e8b4-5c1f-4f24-88cb-3c3a4e26b6b1' \
--header 'Authorization: Bearer <token>' \
--header 'Content-Type: application/json' \
--data-raw '{
"customerIdWithBiller": "customer-5561",
"billReference": "BILLREF98765",
"callbackData": {}
}'