Send a multi-day WhatsApp drip campaign straight from Google Sheets

flowchart TD trig(("user launches campaign")):::human s0["pull and validate contacts"]:::svc s1["create group and send day0 message"]:::svc s2[("log results sent")]:::store trig --> s0 s0 --> s1 gx{"+ which followups to schedule"}:::gate s1 --> gx p00["send day3 message"]:::task gx -->|"day3 followup"| p00 p10["send day7 message"]:::task gx -->|"day7 followup"| p10 jn{"+ all messages sent"}:::gate p00 --> jn p10 --> jn jn --> s2 out[/"full day0-3-7 sequence delivered"/]:::out pay{{"consistent follow-up without manual sending"}}:::pay s2 --> out out --> pay classDef task fill:#e7f6fe,stroke:#34b8f0,color:#2c2a29 classDef svc fill:#f6f8fa,stroke:#7c8795,color:#2c2a29 classDef mi fill:#e7f6fe,stroke:#0079a8,color:#2c2a29,stroke-width:2px classDef human fill:#fff,stroke:#0079a8,color:#0079a8 classDef store fill:#f6f8fa,stroke:#0079a8,color:#2c2a29 classDef trig fill:#00a4eb,stroke:#0079a8,color:#fff,font-weight:bold classDef trigtime fill:#00a4eb,stroke:#0079a8,color:#fff,font-weight:bold classDef trigdata fill:#8ad4f5,stroke:#0079a8,color:#06314c,font-weight:bold classDef gate fill:#fff,stroke:#e8a23d,color:#6b4708,font-weight:bold classDef out fill:#1f9d6b,stroke:#167a53,color:#fff,font-weight:bold classDef pay fill:#06314c,stroke:#021f33,color:#fff