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