Retrieves detailed information about a specific project adder by its unique identifier.

Business Context:
Adders represent additional upgrades, equipment, or work items beyond the base solar
installation. Use this endpoint to get complete details about a specific adder,
including its name, pricing, and reference information.

Common Adder Types:

• Electrical Upgrades: Panel upgrades, sub-panels, electrical work
• Structural Work: Roof repairs, reinforcement, re-roofing
• Additional Equipment: EV chargers, energy storage, monitoring systems
• Site Preparation: Tree removal, trenching, access improvements
• Permits and Fees: Additional permit costs, utility fees

Response Information:

• Complete adder details (name, reference ID, subtotal)
• Pricing and cost breakdown
• Integration context and relationships

Common Use Cases:

• Displaying adder details in project management interfaces
• Cost breakdown and pricing analysis
• Integration with billing and invoicing systems
• Project estimation and proposal generation