Utilize the ManagedServices resource provider to perform an offer registration for an Azure Marketplace Offer (aka Lighthouse)

Microsoft.ManagedService.bicep

targetScope = 'subscription'
param name string = guid(utcNow())
@description('Long Name of your Partner Center Offering')
param definitionName string
param definitionDescription string = ''
@description('The Service Provider\'s Azure AD Tenant GUID')
param managedByTenantId string
@description('The AdminAgents, or other, Azure AD Group GUID')
param adminAgents string
param authorizations array = [
  {
    principalId: adminAgents
    principalIdDisplayName: 'AdminAgents'
    // Contributor
    roleDefinitionId: 'b24988ac-6180-42a0-ab88-20f7382dd24c'
    delegatedRoleDefinitionIds: []
  }
  {
    principalId: adminAgents
    principalIdDisplayName: 'AdminAgents'
    // User Access Administrator
    roleDefinitionId: '18d7d88d-d35e-4fb5-a5c3-7773c20a72d9'
    delegatedRoleDefinitionIds: [
        // Reader
        'acdd72a7-3385-48ef-bd42-f606fba81ae7'
        // Contributor
        'b24988ac-6180-42a0-ab88-20f7382dd24c'
    ]
  }
]
@description('The Partner short name')
param publisherId string
@description('The Offer ID from Partner Center')
param offerId string
@description('The Plan ID from Partner Center')
param planId string
@description('The Plan Version from Partner Center')
param planVersion string

resource name_resource 'Microsoft.ManagedServices/registrationDefinitions@2019-06-01' = {
  name: name
  plan: {
    name: planId
    product: offerId
    publisher: publisherId
    version: planVersion
  }
  properties: {
    registrationDefinitionName: definitionName
    description: definitionDescription
    managedByTenantId: managedByTenantId
    authorizations: authorizations
  }
}