User Story
As a developer, I want to ensure that payments can only be initiated for networks that are enabled, so that we can control which networks are actively supported and prevent payments on unsupported networks.

Acceptance Criteria

1. GIVEN a network has is_enabled set to false
   WHEN a payment is initiated via POST: /sender/orders
   THEN the request should fail with an appropriate error message

2. GIVEN the setRPCClients function is called
   WHEN it fetches networks
   THEN only networks with is_enabled set to true should be fetched and used for indexing

3. GIVEN a new network is added
   WHEN the is_enabled field is not explicitly set
   THEN it should default to false

4. GIVEN a database migration is generated
   WHEN the migration is applied
   THEN the network table should have a new is_enabled column, defaulting to false

Tech Details

1. Generate a database migration to add the is_enabled field to the network table, defaulting to false.
2. Add the is_enabled field to the Network entity in the database schema.
3. Update the setRPCClients function to only fetch and connect to enabled networks.
4. Add validation in POST: /sender/orders to ensure payments can only be initiated for enabled networks. See here
5. Write unit tests to verify:
   • Payments are blocked for disabled networks.
   • Only enabled networks are fetched and used in setRPCClients.
   • The is_enabled field defaults to false for new networks.

Notes/Assumptions

• Existing networks will need to be updated manually to set is_enabled to true if they are actively supported.
• The POST: /sender/orders endpoint should return a clear error message (e.g., "Provided token is not supported for the specified network") when a payment is attempted on a disabled network.