Apple Pay call is missing field paymentInformation.card.number

This Ruby library looks like it should support Apple Pay. However when submitting the request, it seems that the API is looking for a card number, not the token provided by the Apple Pay Javascript library. Here's a sample of my code:

client_reference_information = CyberSource::Ptsv2paymentsClientReferenceInformation.new
client_reference_information.code = order.order_number

processing_information = CyberSource::Ptsv2paymentsProcessingInformation.new
processing_information.commerce_indicator = "internet"
processing_information.capture = true

processing_information.payment_solution = '001'

mobile_payment = CyberSource::Ptsv2paymentsPaymentInformationFluidData.new
mobile_payment.key_serial_number = "eyJ2ZXJzaW9uIjoiRUNfdjEiLCJkYXRhIjoiZktI..."
mobile_payment.descriptor = "RklEPUNPTU1PTi5BUFBMRS5JTkFQUC5QQVlNRU5U"
mobile_payment.encoding = "Base64"
payment_information.fluid_data = mobile_payment

request = CyberSource::CreatePaymentRequest.new
request.processing_information = processing_information
request.client_reference_information = client_reference_information
request.payment_information = payment_information

payments_api_instance = CyberSource::PaymentsApi.new(
  CyberSource::ApiClient.new,
  MerchantConfiguration.new.merchantConfigProp
)
data, status_code, _headers = payments_api_instance.create_payment(request)

The response I'm getting back is:

Exception: #<CyberSource::ApiError: {
  :code=>400, 
  :response_headers=>{
    "Content-Type"=>"application/json", 
    "Content-Length"=>"237", 
    "X-Cnection"=>"close", 
    "x-response-time"=>"192ms", 
    "Strict-Transport-Security"=>"max-age=31536000", 
    "v-c-correlation-id"=>"0cacc2cc-1bb3-4ea7-96d0-d8e01cb1de9e"}, 
  :response_body=>"{
    "submitTimeUtc":"2020-05-22T21:55:51Z",
    "status":"INVALID_REQUEST",
    "reason":"MISSING_FIELD",
    "message":"Declined - The request is missing one or more fields",
    "details":[{"field":"paymentInformation.card.number","reason":"MISSING_FIELD"}]
    }"}>

As you know, an Apple Pay request would not include the card number when opting to have CyberSource decrypt the Apple Pay token. Any help here would be greatly appreciated!

CyberSource / cybersource-rest-client-ruby

Apple Pay call is missing field paymentInformation.card.number #43