Purchase_Flow
Recommended sequence: narrow the catalog, inspect checkout requirements for custom products, quote with final configuration, then purchase.
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1. catalog_categories2. catalog_search { category, q, limit }3. catalog_checkout_requirements { catalogItemId }4. quote_create { catalogItemId, quantity, configuration? }5. purchase_create { quoteId | (catalogItemId, quantity, configuration?), idempotencyKey }6. purchase_get_status { purchaseId }7. service_list / service_get8. domain_* or server_* management actions9. router_api_key_create for OpenAI-compatible credit services