"proof of delivery" meaning in English

{
  "forms": [
    {
      "form": "proofs of delivery",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "proofs of delivery"
      },
      "expansion": "proof of delivery (plural proofs of delivery)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Entries with translation boxes",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with 1 entry",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w"
        }
      ],
      "glosses": [
        "A document that substantiates that a carrier has satisfied its terms of a contract of carriage for cargo by confirmation of the recipient or consignee."
      ],
      "id": "en-proof_of_delivery-en-noun-kWswWUGs",
      "related": [
        {
          "word": "advice of delivery"
        }
      ],
      "synonyms": [
        {
          "word": "POD"
        }
      ]
    }
  ],
  "word": "proof of delivery"
}

{
  "forms": [
    {
      "form": "proofs of delivery",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "proofs of delivery"
      },
      "expansion": "proof of delivery (plural proofs of delivery)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "related": [
    {
      "word": "advice of delivery"
    }
  ],
  "senses": [
    {
      "categories": [
        "English countable nouns",
        "English entries with incorrect language header",
        "English lemmas",
        "English multiword terms",
        "English nouns",
        "Entries with translation boxes",
        "Pages with 1 entry",
        "Pages with entries",
        "Translation table header lacks gloss"
      ],
      "glosses": [
        "A document that substantiates that a carrier has satisfied its terms of a contract of carriage for cargo by confirmation of the recipient or consignee."
      ],
      "synonyms": [
        {
          "word": "POD"
        }
      ]
    }
  ],
  "word": "proof of delivery"
}