{"service":"identifier-checksum-api","version":"1.0.0","description":"Validate / detect / compute check digits across 13 identifier standards (cards, IBAN, ISBN, barcodes, IMEI, ISIN, routing, NPI) in one call.","standards":["credit-card","luhn","iban","isbn13","isbn10","ean13","ean8","upca","gtin14","imei","isin","aba","npi"],"endpoints":["/v1/validate","/v1/detect","/v1/checkdigit","/v1/standards","/health","/version","/openapi.json"],"docs":"POST { \"value\": \"4111111111111111\" } to /v1/validate. Omit \"type\" to auto-detect."}