Add membershipPointsEarned property to ProgramMembership

[vholland]

Lots of email messages about program memberships describe the points earned. I propose adding a membershipPointsEarned property to ProgramMembership.

The markup might looking something like:

{
  "@context": "http://schema.org/",
  "@type": "ProgramMembership",
  "name": "ACME customer rewards",
  "membershipPointsEarned": {
    "@type": "QuantitativeValue",
    "name": "Starpoints",
    "value": 500
  }
}

The expected type of QuantitativeValue is to allow authors to use their custom name for the point system.

[danbri]

Care to file a PR?

[danbri]

is the intent that it reports the total on some account, or that it reports an additional number of points corresponding to some transaction being reported in the same message?

[vholland]

The former. A lot of email messages contain reports of the number of points/miles/stars someone has earned.

[RichardWallis]

Implemented in release 3.5