購入者

1. Origins, structure, and basic meaning

• Structure: 購入者 (reading こうにゅうしゃ) is a noun for a person or party that has actually paid for and purchased a product or service.
• Basic usage: It identifies the person reporting a defect and the party receiving a warranty and instructions.

2. Common pitfalls and similar expressions

• Completed transaction
  • 購入者 is an actual buyer, distinct from a prospective customer who has only shown interest.
• Particle roles
  • In 購入者から連絡がある, から marks the source; in 購入者に渡す, に marks the recipient.