{"functions":[{"name":"send_direct_mail","description":"Activates high-value Three Cats Coffee customers for a direct mail campaign. Sends a personalized postcard with a unique SALBxx voucher code to each high-value converter.","parameters":[{"name":"campaign_name","type":"string","description":"Name of the campaign e.g. dm_tcc_hv_spring_2026","required":true},{"name":"segment_data","type":"string","description":"JSON array of customer records with name, address, and voucher_code fields","required":true},{"name":"mail_type","type":"string","description":"postcards, letters, or self_mailers. Default: postcards","required":false}],"endpoint":"https://threecats-directmail-5nth.vercel.app/api/send-direct-mail","http_method":"POST","auth_requirements":[]}]}