API ReferenceBillingSave card on fileCopy pageView as MarkdownOpen in ChatGPTOpen in ClaudeServer URLloading...POST/simpleserve/v1/billing/cardSendHeaderHeader Parametersauthorization?AuthorizationDefault""xi-api-key?Xi-Api-KeyDefault""Response Body200application/json422application/jsoncURLJavaScriptGoPythonJavaC#Rustcurl -X POST "https://example.com/simpleserve/v1/billing/card"200422nullList Keys GETPrevious PageCreate top-up checkout POSTNext Page