API Actions JSON

I have an API i am writing to that takes JSON input, the API requires a combination of strings and literals
Here is a copy of it

{
  "name": "{{api_get_rezdy_booking.data.bookings[0].customer.name}}",
  "email": "{{api_get_rezdy_booking.data.bookings[0].customer.email}}",
  "invoiceEmail": "{{api_get_rezdy_booking.data.bookings[0].customer.email}}",
  "overdueNoticeEmail": "{{api_get_rezdy_booking.data.bookings[0].customer.email}}",
  "phoneNumber": "{{api_get_rezdy_booking.data.bookings[0].customer.phone}}",
  "phoneNumberMobile": "{{api_get_rezdy_booking.data.bookings[0].customer.mobile}}",
  "language": "{{api_get_rezdy_booking.data.bookings[0].customer.preferredLanguage.uppercase()}}",
  "isPrivateIndividual": "{{api_get_rezdy_booking.data.bookings[0].customer.companyName?true:false}}", //Should be literal boolean
  "isSupplier": false,
  "invoiceSendMethod": "EMAIL",
  "emailAttachmentType": "LINK",
  "postalAddress": {
    "addressLine1": "{{api_get_rezdy_booking.data.bookings[0].customer.addressLine}}",
    "addressLine2": "{{api_get_rezdy_booking.data.bookings[0].customer.state}}",
    "postalCode": "{{api_get_rezdy_booking.data.bookings[0].customer.postCode}}",
    "city": "{{api_get_rezdy_booking.data.bookings[0].customer.city}}",
    "country": {
      "id": "{{filter_county_list.id}}" //Should be literal number
    }
  },
  "invoicesDueIn": 0,
  "invoicesDueInType": "DAYS",
  "currency": {
    "id": "{{filter_currency_list.id}}", //Should be literal number
    "code": "{{filter_currency_list.code}}",
    "description": "{{filter_currency_list.description}}",
    "factor": "{{filter_currency_list.factor}}" //Should be literal number
  }
}

If I remove the " characters around the {{filter_country_list.id}} or any of the others, then the JSON says it is invalid, so how do I insert my dynamic literal data?

I am sure I am just doing something dumb here… in fact I think @mebeingken helped me with this once before and I can not find the topic.

Ok figured this out, there was nothing wrong with the JSON, there was something wrong with one of my variables before this step.