Collect payment from customer

curl --request POST \
  --url http://sandbox.mintlify.com/collect \
  --header 'Content-Type: application/json' \
  --header 'X-API-Key: <api-key>' \
  --data '{
  "amount": 123,
  "phoneNumber": "<string>"
}'

{
  "amount": 123,
  "createdAt": "<string>",
  "currency": "<string>",
  "description": "<string>",
  "fee": 123,
  "id": "<string>",
  "merchantId": 123,
  "paymentType": "collection",
  "phoneNumber": "<string>",
  "status": "pending",
  "telecomOperator": "mtn",
  "updatedAt": "<string>"
}