When trying to access a value from key, getting `[]': no implicit conversion of String into Integer (TypeError)

Question

So I am using Full Contact api to fill in information about certain companies. I am trying to create an array of values for two keys: "lookupDomain" and "orgName" which (from my understanding) are located in the hash lookupDomain.

Here is a snippet of my code for the RestClient.post request and a method for creating the array @parsed_output:

def get_org_info(company_name)
        response = RestClient.post("https://api.fullcontact.com/v3/company.search",{"companyName" => "#{company_name}",}.to_json, {content_type: :json, accept: :json, :authorization => "Bearer SECRET KEY"})
        JSON.parse(response.body)
    end

    def parse_org_info(info_output)
        @parsed_output << {lookupDomain: info_output["lookupDomain"], lookupDomain: info_output["orgName"]}
        p @parsed_output
    end

I keep getting the response:

`[]': no implicit conversion of String into Integer (TypeError)

I am not sure what I am doing wrong. I have also tried putting in numbers that should index the object in the hash I want but I just get an output of everything (i.e location, logo, etc.)

Thank you in advanced for any help! Please forgive me if this is an obvious mistake, I am very new to this.

Thank you