Write to the database the Facebook API call

I need some help. I have this result below in the call of Facebook's Api campaigns. In the actions part, how do I write to the database only the part action_type: comment?

{
  "data": [
    {
      "adsets": {
        "data": [
          {
            "name": "Teste adsets",
            "ads": {
              "data": [
                {
                  "name": "Teste ads",
                  "insights": {
                    "data": [
                      {
                        "actions": [
                          {
                            "action_type": "comment",
                            "value": "8"
                          },
                          {
                            "action_type": "like",
                            "value": "79"
                          },
                          {
                            "action_type": "post",
                            "value": "5"
                          },
                          {
                            "action_type": "post_reaction",
                            "value": "331"
                          },
                          {
                            "action_type": "video_view",
                            "value": "35659"
                          },
                          {
                            "action_type": "page_engagement",
                            "value": "36082"
                          },
                          {
                            "action_type": "post_engagement",
                            "value": "36003"
                          }
                        ],
                        "date_start": "2017-11-01",
                        "date_stop": "2017-11-30"
                      }
                    ],
                    "paging": {
                      "cursors": {
                        "before": "teste",
                        "after": "teste"
                      }
                    }
                  },
                }
              ],
              "paging": {
                "cursors": {
                  "before": "fadasdasfsdfçasdddasf,sdlf",
                  "after": "fdspkfsdjfksdjfksdjfksdjfsd"
                }
              }
            },
          },
          {
            "name": "Teste 1 adsets",
            "ads": {
              "data": [
                {
                  "name": "Teste 1 ads",
                  "insights": {
                    "data": [
                      {
                        "actions": [
                          {
                            "action_type": "like",
                            "value": "7"
                          },
                          {
                            "action_type": "post",
                            "value": "1"
                          },
                          {
                            "action_type": "post_reaction",
                            "value": "61"
                          },
                          {
                            "action_type": "video_view",
                            "value": "8295"
                          },
                          {
                            "action_type": "page_engagement",
                            "value": "8364"
                          },
                          {
                            "action_type": "post_engagement",
                            "value": "8357"
                          }
                        ],
                        "date_start": "2017-11-01",
                        "date_stop": "2017-11-30"
                      }
                    ],
                    "paging": {
                      "cursors": {
                        "before": "rsadas",
                        "after": "dasadas"
                      }
                    }
                  },
                }
              ],
              "paging": {
                "cursors": {
                  "before": "cfksjdkfjsdkfjsdfsd",
                  "after": "fsdfsdfsdfsdfsd"
                }
              }
            },
          },