Add the following to config/settings_schema.json

  {
    "name": {
      "en": "Beam"
    },
    "settings": [
      {
        "label": {
          "en": "API Key"
        },
        "type": "text",
        "id": "beam_api_key"
      },
      {
        "label": {
          "en": "SDK Version"
        },
        "type": "text",
        "id": "beam_sdk_version"
      },
      {
        "label": {
          "en": "Base URL"
        },
        "type": "text",
        "id": "beam_base_url"
      },
      {
        "label": {
          "en": "Statsig API Key"
        },
        "type": "text",
        "id": "beam_statsig_api_key"
      },
      {
        "label": {
          "en": "Store Domain"
        },
        "type": "text",
        "id": "beam_store_domain"
      },
      {
        "label": {
          "en": "Chain ID"
        },
        "type": "number",
        "id": "beam_chain_id"
      },
      {
        "label": {
          "en": "Store ID"
        },
        "type": "number",
        "id": "beam_store_id"
      }
    ]
  },

The config/settings_data.json should then reflect the values:

    "beam_api_key": "beamtest-eqbm7NyrAslP.94a8a48a-ca89-45df-b4c8-2d0e2c486bf9",
    "beam_sdk_version": "v1.31.0",
    "beam_base_url": "https:\\/\\/staging-central-backend.beamimpact.com",
    "beam_statsig_api_key": "client-oe3JzxuVxvdKjXiZcaJfLweQlFa9BhcA1l5OdhJUEtU",
    "beam_chain_id": 55,
    "beam_store_id": 80,

The variables can be used in Liquid templating:

{{ settings.beam_api_key }}
{{ settings.beam_sdk_version }}
{{ settings.beam_base_url }}
{{ settings.beam_statsig_api_key }}
{{ settings.beam_store_domain }}
{{ settings.beam_chain_id }}
{{ settings.beam_store_id }}

<script type="module">

import { init } from "<https://sdk.beamimpact.com/web-sdk/>{{ settings.beam_sdk_version }}/dist/integrations/beam.js"
import { StatsigPlugin } from "<https://sdk.beamimpact.com/web-sdk/>{{ settings.beam_sdk_version }}/dist/integrations/statsig.js"

const beam = await init({
  apiKey: "{{ settings.beam_api_key }}", // i.e., "abc123.xyz456"
  chainId: {{ settings.beam_chain_id }}, // i.e., 1000
  storeId: {{ settings.beam_store_id }}, // i.e., 50000
  domain: "{{ settings.beam_store_domain }}", // i.e., "pets.com"
  // Base URL is optional - it is used to change to a staging server
  baseUrl: "{{ settings.beam_base_url }}",
  plugins: [
    new StatsigPlugin({ statsigApiKey: "{{ settings.beam_statsig_api_key }}" })
  ], // Beam Plugins, such as Statsig (see documentation)
});

</script>

You should be able to edit the values without opening the code by going to Theme > Customize on the themes page.