Recommended MPCard
This tutorial recommends using Flash Card (VISA · virtual · BIN 40433705) to subscribe. Cloud Card also work.
Full card rules: Restricted Merchant & Transaction Policy.
⚡ Quick Summary (TL;DR)
Recommended card: Flash Card (BIN 40433705)
Estimated time: 10–15 minutes
Key prerequisites: Slack account + MPChat Flash Card
Card declined? Check: ① Balance ≥ $10 ② US billing address ③ Avoid rapid retries
📖 Overview
Slack Pro unlocks unlimited message history, unlimited apps, group huddles, and Slack Connect. Billing is per active user / month. Pro costs $8.75/user/month billed monthly or $7.25/user/month billed annually; Business+ is $18 / $15. This tutorial focuses on upgrading a workspace to Pro.
🔑 Prerequisites
Slack workspace: You need admin/owner access. Create one free at slack.com.
Network: Use a stable connection and a valid US billing address at checkout for higher approval rates.
Funding ready: Pro is $8.75/user/month (monthly) or $7.25 (annual). Top up enough USDT to cover the charge + $1 verification hold.
📝 Step-by-Step Subscription Guide
Phase 1 – Prepare the MPCard
Top up USDT
Path: MPChat App → Wallet → Deposit
- Copy your USDT deposit address
- Send from an external wallet or exchange
- Wait for confirmation (typically 5–15 min)Issue a Flash Card (VISA · BIN 40433705)
Path: MPChat App → MPCard → New Card
- Card type: Flash Card
- Generated instantly; save card number, expiry and CVVFund the card
Path: MPChat App → Wallet → Transfer
- From: MP Wallet (USDT) → To: MPCard (USD)
- Amount: at least $10 (includes $1 verification buffer)
Phase 2 – Slack Pro Subscription
Sign in to your workspace and open slack.com/pricing
Choose Pro (or Business+) and billing cycle (monthly/annual)
Click Upgrade → enter workspace admin billing settings
Add Credit / Debit Card as the payment method
Plan comparison
Plan | Monthly / user | Annual / user | Notes |
Free | $0 | $0 | 90-day history limit |
Pro ★ | $8.75 | $7.25 | Unlimited history & apps |
Business+ | $18 | $15 | SSO / compliance / AI extras |
Phase 3 – Payment Details (critical step)
Payment method: select Credit / Debit Card → Add a new card
Card details (MPChat App → MPCard → card details):
Card Number: 16-digit number
Expiry Date: MM / YY
CVV: 3-digit security code
Name on card: use your real name (Latin letters)Billing address: enter a valid US address (state and ZIP must be consistent):
Street: 1234 Maple Street
City: San Francisco
State: CA
ZIP: 94102
Country: United States
Verification & activation
Slack Pro may perform a $0–$1 pre-authorization for card verification.
After payment succeeds, your subscription activates immediately.
Visit https://slack.com/pricing to confirm your active plan.
⚠️ Notes & Troubleshooting
Only workspace owners/admins can change billing.
Slack fair billing prorates seats when members join/leave.
Cancel: Workspace settings → Billing → Cancel plan.
Common payment failures
Error | Fix | Priority |
Card declined | Verify balance, billing address region, and card type match. | ⭐⭐⭐⭐⭐ |
Address invalid | Use a real US billing address; state and ZIP must be consistent. | ⭐⭐⭐⭐ |
Payment pending / auth failure | Wait 15 min, top up balance, retry once. Do not retry rapidly. | ⭐⭐⭐ |