Android SMS Gateway Scenario 1669: Ecommerce webhooks in practice

Summary

Ecommerce webhooks in scenario 1669 are trade-in quotes: trade-in.quote_ready fires, SMS with quote last-four and an expiry window, portal for the IMEI. Unlike order.paid, restock, refund, subscription, gift-card, BOPIS, split-shipment, RMA, COD, preorder, price-match, remaining-line, warranty, loyalty expiry, backorder, invoice.corrected, donation receipt, wishlist.in_stock, try-on kit_due, sample-sale hold_expiring, dropship.ack_late, raincheck.ready, class.waitlist_released, subscription.pause_ending, kit.incomplete, storecredit.issued, or layaway.due, this event is a quote clock, not a layaway due.

Service pricing is devices plus SMS send volume. You bring the Android phone and operator SMS credit. Free is 1 device, 300 SMS lifetime, 300 contacts. Developer is 25,000 SMS per year. Starter, Professional, and Business list Unlimited SMS as platform send volume; devices and airtime stay metered.

An IMEI in SMS is device identity you leaked. Send quote last-four. Keep the IMEI in the account. Honor STOP.

Key takeaways

• Trade-in webhooks are quote last-four and expiry window — never an IMEI or VIN in SMS.
• Verify signatures before the SIM fires. A replayed trade-in.quote_ready is a second nag.
• Keep checkout OTP off the CX tablet that dumps quote bursts.
• Service pricing is devices plus SMS send volume. You bring the Android phone and operator credit.
• Free is 1 device, 300 SMS lifetime, 300 contacts. Developer is 25,000 SMS per year.
• Honor STOP. Quote nags are promotional even when the offer looks transactional.

Related reading

Start from SMS webhook integration, compare device and SMS volume pricing, open transactional SMS, and review FTC advertising notes where they apply.

Context

CX desks land here after a replayed trade-in.quote_ready double-nagged a shopper, or after an IMEI leaked in a “helpful” template. Checkout OTP cannot share that tablet.

Core scenario guidance

Verify signatures. Template: quote last-four + window. Drop IMEIs. Honor STOP. Isolate OTP.

Canary a staff quote after OS updates. MCP wraps REST. Developer Center owns fields.

Cost and ownership

Devices + volume + operator airtime on every retry. Developer is 25,000 SMS per year. Free (1 / 300 / 300) proves pairing, not a trade-in desk.

Operations

Daily last-seen, battery, duplicate quote ids. After a webhook secret rotate, one staff canary. On-call before unattended expiry cutoffs.

Security and compliance

Quote SMS reveal offer amounts. Encrypt at rest. Never log IMEIs. Verify TLS on every callback.

Decision guide

Ship when signatures, last-four templates, STOP, and OTP isolation exist. Delay if a replay can double-nag. If zero phone ops is mandatory, evaluate CPaaS for that slice.

Checklist

• Verify signatures.
• No IMEI in SMS.
• Honor STOP.
• OTP isolated.
• Spare paired.

Next steps

Return to Android SMS gateway API guide, compare device and SMS volume pricing, open device setup, and confirm APIs in SMS API documentation.

Deep dive: production hardening

Signature checks before radio are non-negotiable. Replayed trade-in.quote_ready still spends airtime. Battery exemptions dominate overnight expiry windows.

Deep dive: scaling and failure modes

Scale is quotes times expiry days, not a blast of the catalog. Never claim unlimited free cloud SMS credits with no device or volume meter.

Deep dive: integration discipline

Developer Center owns live API parameters. Persist quote id. MCP is a REST wrapper. If zero phone ops is mandatory, evaluate CPaaS. You bring the Android phone and operator credit.