feat: add python examples

docs/libraries/02-getting-started.mdx

@@ -41,7 +41,7 @@ You need to keep your API Key secure and never share it with anyone.
   ]}>
   <TabItem value="python">
   ```python
-  # ADD PYTHON CODE HERE
+  pip install payments-py
   ```
   </TabItem>
   <TabItem value="typescript">
@@ -62,7 +62,11 @@ You need to keep your API Key secure and never share it with anyone.
   ]}>
   <TabItem value="python">
   ```python
-  # ADD PYTHON CODE HERE
+  # @see https://docs.nevermined.app/docs/tutorials/integration/nvm-api-keys  
+  nvm_api_key = 'eyJhbGciOiJFUzI1NksifQ.ey .....'
+
+  # If you want to connect to production use 'arbitrum' as environment
+  payments = Payments(nvm_api_key, environment=Environment.get_environment('testing'))  # 'local' | 'staging' | 'testing' | 'arbitrum' | 'peaq' | 'custom'
   ```
   </TabItem>
   <TabItem value="typescript">

docs/libraries/03-assets-registration.md

@@ -30,7 +30,15 @@ Nevermined Payment Plans enable the set up of time-based or request-based gating
   ]}>
   <TabItem value="python">
   ```python
-  # ADD PYTHON CODE HERE
+  USDC_ERC20_TESTING = '0x75faf114eafb1BDbe2F0316DF893fd58CE46AA4d' # This is the USDC ERC20 address in the testing network
+
+  plan_DID = payments_builder.create_credits_plan({
+    name: 'E2E Payments Plan', 
+    description: 'description', 
+    price:15000000n, # 15 USDC
+    token_address: USDC_ERC20_TESTING,
+    amount_of_credits: 100 # It means when someone purchase this plan, they will get 100 credits
+  })
   ```
   </TabItem>
   <TabItem value="typescript">
@@ -59,8 +67,16 @@ Nevermined Payment Plans enable the set up of time-based or request-based gating
   ]}>
   <TabItem value="python">
   ```python
-  # ADD PYTHON CODE HERE
-  ```
+  USDC_ERC20_TESTING = '0x75faf114eafb1BDbe2F0316DF893fd58CE46AA4d' # This is the USDC ERC20 address in the testing network
+
+  plan_DID = payments.create_time_plan({
+    name: "My 1 Month Plan",
+    description: "test",
+    price:15000000n, # 15 USDC
+    token_address: USDC_ERC20_TESTING,
+    duration: 30, # 30 days
+    tags: ["test"]
+  })  ```
   </TabItem>
   <TabItem value="typescript">
   ```typescript  
@@ -93,8 +109,26 @@ Before registering an AI Agent, you need to have a Payment Plan created.
   ]}>
   <TabItem value="python">
   ```python
-  # ADD PYTHON CODE HERE
-  ```
+  # When you create an agent, you need to provide the endpoints that the agent exposes and are protected by the Payment Plan
+  # You must specify the HTTP method and the URL pattern that the agent exposes
+  # You can use wildcards (.*) to match any string
+  agent_endpoints = [
+     { 'POST': 'https://example.com/api/v1/agents/(.*)/tasks' },
+     { 'GET': 'https://example.com/api/v1/agents/(.*)/tasks/(.*)' }
+  ]
+
+  agent_DID = payments_builder.create_service({
+    plan_DID, # The DID of the Payment Plan we created before
+    name: 'My AI Assistant',
+    description: 'description of the assistant',
+    serviceType: 'agent',
+    serviceChargeType: 'fixed',
+    authType: 'bearer',
+    token: 'changeme',
+    amountOfCredits: 1,
+    endpoints: agent_endpoints,
+    openEndpoints: ['https://example.com/api/v1/rest/docs-json']
+  })  ```
   </TabItem>
   <TabItem value="typescript">
   ```typescript

docs/libraries/05-order-plans.md

@@ -20,8 +20,10 @@ With the Payments Library, Subscribers can order Plans paying in Crypto. The pro
   ]}>
   <TabItem value="python">
   ```python
-  # ADD PYTHON CODE HERE
-  ```
+  # Here we are ordering the Plan created in the previous steps
+  order_result = payments.order_plan(plan_DID)  
+  # OUTPUT: orderResult: 
+  #  { success: True, agreementId: '0xaabbcc' }   ```
   </TabItem>
   <TabItem value="typescript">
   ```typescript
@@ -50,8 +52,15 @@ Time-based Plans have a balance of 1 credit for subscribers. When the plan expir
   ]}>
   <TabItem value="python">
   ```python
-  # ADD PYTHON CODE HERE
-  ```
+    balance_result = payments.get_plan_balance(plan_DID)
+    # OUTPUT: balanceResult:
+    # {
+    #  "planType": 'credits",
+    #  "isSubscriptor": True,
+    #  "isOwner": False,
+    #  "balance": 10000000
+    #}  
+    ```
   </TabItem>
   <TabItem value="typescript">
   ```typescript

docs/libraries/06-query-agents.md

@@ -28,7 +28,12 @@ Once a user is a subscriber sending a request is quite simple.
   ]}>
   <TabItem value="python">
   ```python
-  # ADD PYTHON CODE HERE
+  access_config = payments.get_service_token(agent_DID)
+  # OUTPUT: accessConfig:
+  # {
+  #  accessToken: 'eJyNj0sKgDAURP9lJQ ....',
+  #  neverminedProxyUri: 'https://proxy.testing.nevermined.app'
+  # }    
   ```
   </TabItem>
   <TabItem value="typescript">
@@ -58,7 +63,17 @@ The [Nevermined Query Protocol](https://docs.nevermined.io/docs/protocol/query-p
   ]}>
   <TabItem value="python">
   ```python
-  # ADD PYTHON CODE HERE
+  # Here we are configuring the Task we are sending to the Agent. Please check the Query Protocol documentation for more information.
+  # https://docs.nevermined.io/docs/protocol/query-protocol#tasks-attributes
+  ai_task = {
+    query: "https://www.youtube.com/watch?v=0tZFQs7qBfQ",
+    name: "transcribe",
+    "additional_params": [],
+    "artifacts": []
+  }
+
+  task_result = payments.ai_protocol.create_task(agentDID, ai_task)
+
   ```
   </TabItem>
   <TabItem value="typescript">

docs/libraries/08-process-tasks.md

@@ -33,7 +33,23 @@ The AI Builders can create simple worker AI process subscribing to Nevermined to
   ]}>
   <TabItem value="python">
   ```python
-  # ADD PYTHON CODE HERE
+  import asyncio
+
+  asyncio.create_task(builder.ai_protocol.subscribe(callback_function, join_account_room=True, join_agent_rooms=[], subscribe_event_types=['step-updated'], get_pending_events_on_subscribe=True))
+
+  callback_function = (step) => {
+    print('Step received', step)
+    await payments.ai_protocol.update_step(did=step['did'], 
+                                          task_id=step['task_id'], 
+                                          step_id=step['step_id'], 
+                                          step={'step_id': step['step_id'],
+                                              'task_id': step['task_id'], 
+                                              'step_status': AgentExecutionStatus.Completed.value,
+                                              'output': 'success',
+                                              'is_last': True,
+                                              'cost': 1
+                                          })
+  }
   ```
   </TabItem>
   <TabItem value="typescript">