action gsmtasks_billing_transactions_retrieve { label: "billing_transactions_retrieve" provider: gsmtasks method: GET path: "/billing/transactions/{id}/" encoding: json input: { type: "object" properties: { format: { type: "string" enum: ["json", "xlsx"] } id: { type: "string" format: "uuid" } } required: ["id"] additionalProperties: false } output: { type: "object" additionalProperties: true } }