diff --git a/SUMMARY.md b/SUMMARY.md
index bdd5ffde..3e21ac02 100644
--- a/SUMMARY.md
+++ b/SUMMARY.md
@@ -21,6 +21,7 @@
   * [Aquarius REST API](api-references/aquarius-rest-api.md)
   * [Provider REST API](api-references/provider-rest-api.md)
 * [Building with ocean](building-with-ocean/README.md)
+  * [Obtaining API key](building-with-ocean/obtaining-api-key.md)
   * [Using Ocean libraries](building-with-ocean/using-ocean-libraries/README.md)
       * [Configuration](building-with-ocean/using-ocean-libraries/configuration.md)
   * [Publish assets using hosting services](building-with-ocean/asset-hosting.md)
diff --git a/building-with-ocean/using-ocean-libraries/configuration.md b/building-with-ocean/using-ocean-libraries/configuration.md
index 763d2b67..cd81bde5 100644
--- a/building-with-ocean/using-ocean-libraries/configuration.md
+++ b/building-with-ocean/using-ocean-libraries/configuration.md
@@ -1,12 +1,159 @@
-# Configuring Ocean libraries
+# Configuration
+
+### Obtaining API key
+
+See this [guide](../obtaining-api-key.md) on getting an API key to interact with EVM compatible networks.
+
+#### Create a directory
+
+```
+mkdir my-ocean-project
+cd my-ocean-project
+```
 
 ### Create a `.env` file
 
+{% tabs %}
+{% tab title="Mainnet" %}
+{% code title=".env" %}
 ```
+# Mandatory environment variables
+
+OCEAN_NETWORK=mainnet
+NETWORK_URL=<replace this>
+PRIVATE_KEY=<secret>
+
+# Optional environment variables
+
+AQUARIUS_URL=https://v4.aquarius.oceanprotocol.com/
+PROVIDER_URL=https://v4.provider.mainnet.oceanprotocol.com
+```
+{% endcode %}
+{% endtab %}
+
+{% tab title="Polygon" %}
+{% code title=".env" %}
+```
+# Mandatory environment variables
+
+OCEAN_NETWORK=polygon
+NETWORK_URL=<replace this>
+PRIVATE_KEY=<secret>
+
+# Optional environment variables
+
+AQUARIUS_URL=https://v4.aquarius.oceanprotocol.com/
+PROVIDER_URL=https://v4.provider.polygon.oceanprotocol.com
+```
+{% endcode %}
+{% endtab %}
+
+{% tab title="Local (using Barge)" %}
+{% code title=".env" %}
+```
+# Mandatory environment variables
 NETWORK_URL=http://172.15.0.3:8545/
 AQUARIUS_URL=http://172.15.0.5:5000
 PROVIDER_URL=http://172.15.0.4:8030
-MNEMONIC=<secret>
+
+# Replace PRIVATE_KEY if needed
+PRIVATE_KEY=0xc594c6e5def4bab63ac29eed19a134c130388f74f019bc74b8f4389df2837a58
 OCEAN_NETWORK=development
 ```
+{% endcode %}
+{% endtab %}
+{% endtabs %}
 
+#### Setup dependencies
+
+{% tabs %}
+{% tab title="ocean.js" %}
+```bash
+npm init
+npm install @oceanprotocol/lib@latest dotenv web3 @truffle/hdwallet-provider
+```
+{% endtab %}
+
+{% tab title="ocean.py" %}
+```bash
+python3 -m venv venv
+source venv/bin/activate
+pip3 install wheel
+
+# Install Ocean library. Allow pre-releases to get the latest v4 version.
+pip3 install ocean-lib
+```
+{% endtab %}
+{% endtabs %}
+
+#### Create a configuration file
+
+{% tabs %}
+{% tab title="ocean.js" %}
+{% code title="config.js" %}
+```javascript
+// Import dependencies
+require('dotenv').config();
+const HDWalletProvider = require('@truffle/hdwallet-provider');
+const fs = require('fs');
+const { homedir } = require('os');
+const { ConfigHelper } = require('@oceanprotocol/lib');
+
+// Get configuration for the given network
+let oceanConfig = new ConfigHelper().getConfig(process.env.OCEAN_NETWORK);
+
+// If using local development environment, read the addresses from local file.
+// The local deployment address file can be generated using barge.
+if (process.env.OCEAN_NETWORK === 'development') {
+  const addressData = JSON.parse(
+    fs.readFileSync(
+      process.env.ADDRESS_FILE
+        || `${homedir}/.ocean/ocean-contracts/artifacts/address.json`,
+      'utf8'
+    )
+  );
+  const addresses = addressData[process.env.OCEAN_NETWORK];
+
+  oceanConfig = {
+    ...oceanConfig,
+    oceanTokenAddress: addresses.Ocean,
+    poolTemplateAddress: addresses.poolTemplate,
+    fixedRateExchangeAddress: addresses.FixedPrice,
+    dispenserAddress: addresses.Dispenser,
+    erc721FactoryAddress: addresses.ERC721Factory,
+    sideStakingAddress: addresses.Staking,
+    opfCommunityFeeCollector: addresses.OPFCommunityFeeCollector
+  };
+}
+
+oceanConfig = {
+  ...oceanConfig,
+  nodeUri: process.env.NETWORK_URL,
+  // Set optional properties - Provider URL and Aquarius URL
+  metadataCacheUri: process.env.AQUARIUS_URL || oceanConfig.metadataCacheUri,
+  providerUri: process.env.PROVIDER_URL || oceanConfig.providerUri
+};
+
+const web3Provider = new HDWalletProvider(
+  process.env.PRIVATE_KEY,
+  oceanConfig.nodeUri
+);
+
+module.exports = {
+  web3Provider,
+  oceanConfig
+};
+
+```
+{% endcode %}
+
+
+{% endtab %}
+
+{% tab title="ocean.py" %}
+{% code title="config.py" %}
+```python
+```
+{% endcode %}
+{% endtab %}
+{% endtabs %}
\ No newline at end of file
diff --git a/building-with-ocean/using-ocean-libraries/obtaining-api-key.md b/building-with-ocean/using-ocean-libraries/obtaining-api-key.md
new file mode 100644
index 00000000..164dc87b
--- /dev/null
+++ b/building-with-ocean/using-ocean-libraries/obtaining-api-key.md
@@ -0,0 +1,7 @@
+# Obtaining API key
+
+Choose any api provider of your choice. Some of the commonly used are:
+
+* [Infura](https://infura.io/)
+* [Alchemy](https://www.alchemy.com/)
+* [Moralis](https://moralis.io/)
\ No newline at end of file