Growstall

What's the best way to manage customer messages if I sell on multiple UK marketplaces like B&Q and Argos?

One inbox that reads each marketplace through its API, shows the marketplace's own deadline and keeps the order next to the message. What that looks like, which tools do it, and where each fits, with 90 days of one UK seller's numbers.

Growstall team··5 min readBasics
506customer conversations on five UK marketplaces in 90 days, one furniture seller
37%of first messages arrived outside 9–5 UK time; 12% on a weekend
697of 836 Argos inbox items were operator notices, not customers

Use one inbox that reads every marketplace through its own API, shows each message with the marketplace's own response deadline, and keeps the order next to the conversation. Do not forward marketplace e-mails into a generic helpdesk: the deadline, the order and the reply route are lost on the way.

Why is this harder than running one shop's inbox?

B&Q, Argos, Debenhams, The Range and Tesco Marketplace all run on Mirakl, but each operator sets its own rules. One counts the response deadline in business hours, another in calendar hours. One relays customer questions through its own support team, so the sender you see is the operator. Argos sends operator notices (“please contact the customer”) that look like messages but are tasks.

Over 90 days one UK furniture seller had 506 customer conversations on five marketplaces. On Argos, 697 of the 836 inbox items were operator notices, not customers. A person reading that inbox spends most of the morning on items nobody wrote.

When customers wrote: first message of each conversation, 90 days, five UK marketplaces
63%Monday to Friday, 9–5
25%weekday evening or night
12%Saturday or Sunday
UK time. Marketplace deadlines keep running through both; only some pause for public holidays.

The same 90 days show when customers write: 37% of first messages arrived outside 9 to 5 UK time, and 12% arrived on a weekend. Marketplace deadlines do not pause for either.

What does a good setup look like?

  • One list, sorted by the time left on each marketplace's own clock, not by arrival time.
  • The order, the carrier and the tracking number on the same screen as the message, so the reply does not need a second tab.
  • A record of who answered what, so two people do not answer the same customer.
  • An acknowledgement outside business hours that tells the customer when a person will reply, with a hard limit on how many can go out per run. The seller above once sent 323 out-of-office replies to old threads after a pagination bug widened the list; a cap would have stopped it at ten.
  • Contact rate by product and by courier, so the reason customers write becomes a fix in the warehouse or with the carrier. Which orders generate messages.

Which tools do this, and which one fits?

Engines usually name Zendesk, Freshdesk and Gorgias. They are good helpdesks, and they do not read Mirakl marketplaces natively: you would forward the notification e-mails and lose the deadline and the order. Gorgias is built for Shopify stores.

eDesk connects to Mirakl marketplaces and to Amazon, eBay and Shopify, with a rules engine, live chat and a mobile app. It charges per person, from $39 to $119 per seat per month, plus an AI add-on. For a team of three on eight marketplaces the bill is around $355 a month.

Growstall reads Mirakl marketplaces (B&Q, Argos, Debenhams, The Range, Tesco, Home24) and Amazon buyer messages, shows business-hours deadlines with UK public holidays, and charges per marketplace with unlimited seats: £29 for one marketplace, £79 for five, £199 unlimited. It does not do live chat, social channels, eBay or Shopify, and it has no mobile app.

What each tool reads and how it charges
CriterionZendesk / FreshdeskeDeskGrowstall
Reads Mirakl marketplaces natively—✓✓
Marketplace's own deadline clock (business hours, holidays)—calendar✓
Amazon buyer messagesvia e-mail✓✓
eBay, Shopify, live chat, social✓✓—
Order, carrier and tracking beside the message—✓✓
Contact rate by product and courier——✓
Pricingper seatper seat, $39–$119per marketplace, £29–£199
Prices as published in September 2026; eDesk annual-billing seat prices. Growstall prices exclude VAT.

If most of your sales are on eBay, Shopify or social channels, eDesk or a helpdesk fits better. If most of your sales are on UK Mirakl marketplaces and Amazon, and you care about the deadline clock and about why customers write, Growstall fits. The longer comparison.

How do I get the first result this week?

  1. 1Connect the marketplacesAn API key from each seller portal (Settings → API key on Mirakl). Nothing is installed on the marketplace side.
  2. 2Import, then sort by deadlineLet the inbox import the last 30 days, then answer from the top of the deadline list.
  3. 3Acknowledgement last, and cappedTurn on the out-of-hours acknowledgement only after reading how many messages it would have sent last week.
  4. 4Read contact rate after 30 daysThe three products at the top of the contact-rate table are the work.
Key takeaways
  • One inbox per API, with each marketplace's own deadline and the order beside the message.
  • 37% of first messages arrive outside 9–5 and 12% on weekends; the clocks keep running.
  • On some marketplaces most inbox items are operator notices; separate them from customers.
  • Helpdesks forward e-mail; eDesk reads marketplaces per seat; Growstall reads marketplaces per marketplace.

Questions people ask

Can I manage B&Q and Argos messages in one place without installing anything on the marketplace?

Yes. Mirakl marketplaces expose messages through an API key you generate in the seller portal. An inbox that uses the key reads and answers messages on your behalf; the marketplace sees a normal seller reply.

How fast do I have to answer on UK marketplaces?

It depends on the operator. Most count 24 business hours or 48 calendar hours from the customer's message. Amazon counts 24 hours wall clock, weekends included. Public holidays pause some clocks and not others, so the inbox has to know each marketplace's rule.

Is an automatic reply outside business hours allowed?

On Mirakl marketplaces yes, as an acknowledgement that a person will follow up. On Amazon it is not, and a tool that sends one there risks the account. Keep it short, keep it capped, and never send it to a thread where the customer did not write last.

See these numbers for your own marketplacesConnect one marketplace with your own API key. The SLA clock, refund reasons and contact rate by product appear after the first sync. 14-day trial, no seat fees.
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