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SandboxCreate a sandbox customer

Create a sandbox customer

Create the customer

Switch to sandbox

Turn on the Sandbox switch in the dashboard header.

Open the project

Open the Sandbox project.

Open the customers tab

Select Customers. Only Sandbox projects show Create customer.

Select Create customer

Modem creates a synthetic customer. From the customer’s actions, select Copy customer ID and Copy customer secret. Synthetic gateway authentication needs both. Keep the secret private.

Create the customer with the CLI

modem-cli customers create creates a synthetic customer for a Sandbox project. The output includes the customer ID and the sandboxSecret.

modem-cli customers create --project-id <project-id>

Run a test completion

modem-cli customers complete runs a chat completion billed to a customer. It takes the project, customer, and product IDs, the provider, and either --model with --prompt or a JSON file in --request.

modem-cli customers complete \
  --project-id <project-id> \
  --customer-id <customer-id> \
  --product-id <product-id> \
  --provider openai \
  --model gpt-4o-mini \
  --prompt "Hello"

The command streams by default. --no-stream waits for the whole response. --json prints the full response, or one JSON object per chunk.