curl --request POST \
  --url https://api-m.sandbox.paypal.com/v3/vault/payment-tokens \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '{
  "payment_source": {
    "token": {
      "id": "5C991763VB2781612",
      "type": "BILLING_AGREEMENT"
    }
  }
}'

{
  "id": "8kk8451t",
  "customer": {
    "id": "customer_4029352050"
  },
  "payment_source": {
    "card": {
      "last_digits": "1111",
      "expiry": "2027-02",
      "brand": "VISA",
      "name": "John Doe",
      "billing_address": {
        "address_line_1": "2211 N First Street",
        "address_line_2": "17.3.160",
        "admin_area_2": "San Jose",
        "admin_area_1": "CA",
        "postal_code": "95131",
        "country_code": "US"
      }
    }
  },
  "links": [
    {
      "rel": "self",
      "href": "https://api-m.paypal.com/v3/vault/payment-tokens/8kk8451t",
      "method": "GET",
      "encType": "application/json"
    },
    {
      "rel": "delete",
      "href": "https://api-m.paypal.com/v3/vault/payment-tokens/8kk8451t",
      "method": "DELETE",
      "encType": "application/json"
    }
  ]
}