Update a price plan.

curl -X PUT \
 /price-plans/{id} \
 --header "Content-Type: application/json" \
 --header "Authorization: Bearer <token>" \
 --data '{
    "internalName": "Exclusive pricing for partners.",
    "customer": "https:\/\/example.com\/",
    "applyTrial": "1",
    "payInAdvance": "1",
    "proRata": "",
    "currencyCode": [],
    "price": []
}'

{
  "id": "ad8f1c2c-3b1c-4b0a-8b0a-0b0b0b0b0b0b",
  "internalName": "Exclusive pricing for partners.",
  "status": "<any>",
  "salesChannel": {},
  "type": "<any>",
  "applyTrial": true,
  "payInAdvance": true,
  "proRata": true,
  "freeUnits": {},
  "billingInterval": "1M",
  "showPricePerInterval": "1M",
  "currencyCode": {},
  "price": {
    "amount": 123,
    "createdAt": "2021-01-01T00:00:00+00:00",
    "updatedAt": "2021-01-01T00:00:00+00:00",
    "tenantId": "<string>"
  },
  "custom": true,
  "charge": "ad8f1c2c-3b1c-4b0a-8b0a-0b0b0b0b0b0b",
  "productSetOption": "ad8f1c2c-3b1c-4b0a-8b0a-0b0b0b0b0b0b",
  "product": "<any>",
  "customer": "<any>",
  "inUse": true,
  "checkoutLinkIds": [
    "ad8f1c2c-3b1c-4b0a-8b0a-0b0b0b0b0b0b"
  ]
}