Create a new link token

curl --request POST \
  --url https://api.fabra.io/link_token \
  --header 'Content-Type: application/json' \
  --header 'X-API-KEY: <x-api-key>' \
  --data '{
  "end_customer_id": "abcd-1234-efgh-5678"
}'

{
  "link_token": "abc123def"
}