APIVerve Certified Developer: Verification

• Read every email validation signal, from null MX to normalised duplicates, and map it to accept, review or reject
• Normalise phone numbers to E.164 and screen line type and disposable numbers before sending an SMS
• Parse free-text US addresses, cross-check them against ZIP data and build a dedupe key
• Split human names safely and catch gibberish and offensive usernames at signup without insulting real people
• Recognise the false positives and false negatives each check produces and design around them

Study: Verify Contact Data · 4 lessons

• Geolocate an IP and identify the network that owns it, knowing where the data stops being reliable
• Detect VPN, datacenter and Tor traffic and answer it with step-up checks instead of hard blocks
• Screen IPs against blocklists and scan user-submitted links for known phishing domains
• Parse user agents, detect bots and verify crawlers that claim to be Google or Bing
• Combine network and client signals into one risk score with a clear action per route

Study: Network and Fraud Signals · 4 lessons

• Run Luhn checks locally and use BIN lookups for card facts without handling full card numbers
• Validate IBANs, SWIFT/BIC codes and US routing numbers with field-level errors before a payout
• Screen people and companies against sanctions lists, route fuzzy matches to review and keep an audit record
• Combine contact, network, card and sanctions signals into a weighted risk score with reasons
• Tune allow, review and block thresholds from logged outcomes instead of guesses

Study: Payments and Compliance · 4 lessons