Add Contracts to Subscription

After creating your subscription and configuring gas settings, you need to whitelist your consumer contracts. Only whitelisted contracts can request random numbers from your subscription.

Important: Make sure you've read the Gas Configuration page first. Understanding gas settings is crucial before adding contracts and funds, as your contract-level gas configuration directly impacts performance, costs, and minimum balance requirements

Via Onchain Contracts

Whitelisting Your Module

After deploying your requester module, whitelist it with Supra to enable VRF requests:

deposit::init_vrf_module<T>(client: &signer): SupraVRFPermit<T>

Parameters:

• client - Your signer (must be the whitelisted wallet address)

• T - Your module's type/struct (e.g., YourModule)

Returns:

• SupraVRFPermit<T> - A capability that authorizes your module to interact with Supra VRF

Important: Store the returned SupraVRFPermit<T> capability in your module. This permit is required for all VRF requests.

Disabling a Contract

Temporarily stop a module from making requests without removing it:

deposit::disable_module<T>(client: &signer)

Example:

// Temporarily disable the module
deposit::disable_module<ClientExample>(&signer);

Re-enabling a Contract

Reactivate a previously disabled module:

deposit::enable_module<T>(client: &signer)

Best Practices

Store the Permit Safely: The SupraVRFPermit<T> capability is essential for making VRF requests. Store it in a resource with key ability.

One Permit Per Module: Each module type can only have one permit. Don't try to create multiple permits for the same module.

Module-Specific Limits: Use per-module fee limits to isolate costs, especially for experimental features.

Troubleshooting

"Module disabled" error:

• Check that you're using the correct signer (whitelisted wallet)

• Verify the SupraVRFPermit<T> is properly stored

"Insufficient permissions" error:

• Ensure you called init_vrf_module<T>() after deploying your module

• Verify your wallet was whitelisted first

"Module not whitelisted" error:

• Ensure you called init_vrf_module<T>() after deploying your module

• Verify your wallet was whitelisted first