# WhatsApp Business API Documentation > Unofficial WhatsApp Business API documentation covering messaging limits, templates, error codes 131026 and 459, the 24 hour rule and integration practice. Comprehensive guides for integrating WhatsApp Business API. Learn messaging limits, templates, troubleshooting, and best practices. For the wider picture, including what Meta charges and how the API differs from the free WhatsApp Business app, start at the WhatsApp Business API hub. Official Meta Docs · Browse All Docs ## Messaging 4 articles What is WhatsApp Business API? The Complete Guide for 2026 · WhatsApp Business API is a programmable interface that allows medium to large businesses to broadcast messages to unlimited users, automate customer support with chatbots, and integrate with CRM systems. Unlike the free WhatsApp Business App, the API enables enterprise-scale customer communication. · 9 min read · whatsapp api · WhatsApp Business API pricing in Singapore: 2026 rates and 1 October · Meta charges S$0.0937 a marketing template in Singapore and S$0.0205 for utility, and bills service messages from 1 October 2026. Try the calculator. · 12 min read · pricing · Understanding WhatsApp Business Messaging Limits · Every WhatsApp Business account has a cap on how many unique customers you can message within a 24-hour window. This guide breaks down the different tiers, explains how Meta calculates your limit, and shows you proven strategies to scale up your messaging capacity over time. · 3 min read · messaging limits · WhatsApp Pricing Changes: 1 October 2026 · Meta starts charging for service messages on 1 October 2026, moves nine markets to standalone rates and raises marketing in seven. Every rate from Meta's card. · 9 min read · pricing ## Templates & Rules 2 articles WhatsApp 24h Rule Explained: How Businesses Can Message Customers Again · Understand WhatsApp's 24-hour messaging window rule and learn how businesses can re-engage customers after the window closes. Discover how Voltade helps you send messages again with smart features. · 5 min read · 24-hour rule · WhatsApp Template Best Practices: Get Approved, Avoid Rejection (2026 Guide) · Write WhatsApp Business API templates that get approved fast, avoid auto-recategorization to Marketing, and survive Meta's quality rating system. With Singapore PDPA compliance notes for Voltade clients. · 8 min read · templates ## Troubleshooting 21 articles How to Fix Meta Error 459 (Account Checkpoint) · Error 459 from Meta indicates that your Facebook account has been checkpointed, meaning it is temporarily suspended for security reasons. This comprehensive guide shows you how to resolve this issue, including common scenarios like after paying for Meta verification. · 3 min read · error 459 · WhatsApp Coexistence Limitations: What You Need to Know · Using WhatsApp Business App and Voltade together on the same number? Understand the key limitations of WhatsApp Coexistence mode, including the critical 14-day disconnection rule if you don't open the WhatsApp Business App regularly. · 4 min read · coexistence · WhatsApp Account Blocked? How to Restore Access to Your Blocked Account · Learn how to restore access to your blocked WhatsApp account. This comprehensive guide covers temporary vs permanent blocks, 8 common reasons for account blocking, step-by-step recovery instructions, and proactive measures to prevent future blocks. · 11 min read · blocked account · WhatsApp Error 131026: Message Undeliverable - Complete Troubleshooting Guide · Fix WhatsApp Error 131026 with this comprehensive troubleshooting guide. Learn all 10 causes of message delivery failures including recipient issues, template problems, and India-specific restrictions. Includes step-by-step debug checklist and prevention best practices. · 7 min read · error 131026 · WhatsApp Error Code 131060: Companion Device Message Visibility Issue · Learn how to resolve WhatsApp error code 131060, which occurs when messages are sent from companion devices in Coexistence mode. Understand why this happens and how Voltade displays these errors clearly. · 3 min read · error 131060 · WhatsApp Error: Object With ID Does Not Exist or Missing Permissions · Fix the WhatsApp Business API error 'Unsupported post request. Object with ID does not exist, cannot be loaded due to missing permissions, or does not support this operation' by reauthorizing your Facebook connection. · 2 min read · error · WhatsApp Error: Session Has Expired, Access Token Validation Failed · Fix the WhatsApp Business API error 'Error validating access token: Session has expired' by reauthorizing your Facebook connection. Step-by-step guide to fix expired session issues. · 2 min read · error · How To Unban Your WhatsApp Account Within 24h · Learn how to appeal a WhatsApp ban and get your account restored. This guide covers temporary vs permanent bans, the official appeal process, email templates, and tips to avoid future bans for Singapore businesses. · 7 min read · banned · WhatsApp Error #3: Application Does Not Have API Granular Permission · Fix the WhatsApp Business API error '(#3) Application does not have the API granular permission to make this call' by reauthorizing your Facebook connection and granting required permissions. · 2 min read · error · WhatsApp Error #200: You Do Not Have Permission to Send Messages · Fix the WhatsApp Business API error '(#200) You do not have the necessary permissions required to send messages on behalf of this WhatsApp Business Account' with solutions for both Coexistence and Non-Coexistence flows. · 2 min read · error 200 · Unable to Remove WhatsApp Business App from Meta Business Portfolio · Cannot remove WhatsApp Business app from your Meta Business Portfolio? Learn how to fix this by adjusting your 2FA settings in Meta Business Suite before attempting removal. · 2 min read · meta business suite · WhatsApp Error: You Cannot Access the App Till You Log In to Facebook · Fix the WhatsApp Business API error 'You cannot access the app till you log in to www.facebook.com and follow the instructions given' by completing the Facebook verification process. · 2 min read · error · WhatsApp Error: Unable to Update Contact, Email Already Taken · Fix the WhatsApp CRM error 'Unable to update contact. Please try again later' caused by duplicate email addresses in your contact database. · 2 min read · error · WhatsApp Error: Template Name Not Found, 24-Hour Rule Explained · Fix the WhatsApp Business API error 'Template name not found' by understanding the 24-hour messaging window and how to use pre-approved message templates correctly. · 2 min read · error · WhatsApp Error: Need to Add Payment Method for Broadcast Campaigns · Fix the WhatsApp Business API error 'Need to add payment method first in order to use the WhatsApp campaign broadcast feature' by configuring payment settings in Meta Business Portfolio. · 2 min read · error · WhatsApp Error 131042: Business Eligibility Payment Issue, 72 Hour Block · Fix WhatsApp Business API error 131042 (business eligibility payment issue) by waiting 72 hours and avoiding retry attempts. Learn why this block happens and how to prevent it. · 2 min read · error 131042 · WhatsApp Error: Phone Number Not Eligible to Connect to Business Platform · Fix the WhatsApp error 'Your phone number is not eligible to connect to the WhatsApp Business Platform' by increasing app activity and recreating your account before onboarding. · 2 min read · error · WhatsApp Error: Phone Number Already Registered with INBOX Product · Fix the WhatsApp error 'This phone number is already registered with the INBOX product' by disconnecting the existing partner before onboarding with a new platform. · 2 min read · error · WhatsApp Disconnection: Messages Are Now End-to-End Encrypted Warning · Fix WhatsApp Business API disconnection identified by the yellow 'Messages and calls are now end-to-end encrypted' text. Learn how to re-onboard your number and restore connection. · 2 min read · disconnected · WhatsApp Error: This Account Can No Longer Use WhatsApp, Appeal Guide · Fix the WhatsApp ban message 'This account can no longer use WhatsApp' by submitting a review request through Meta Direct Support. Step-by-step appeal process for banned accounts. · 2 min read · banned · WhatsApp Business API Known Issues and Solutions (2026) · A practical troubleshooting index for common WhatsApp Business API issues, with root causes, fixes, and escalation paths for Singapore teams using Voltade. · 2 min read · whatsapp business api ## Building on the API, not just reading about it Three pages on what you can put in front of a WhatsApp number once it is connected. WhatsApp chatbot What a chatbot is, what Meta charges per message, and where a scripted bot stops being enough. · WhatsApp AI agent What an agent does that a chatbot cannot, and what it needs write access to in order to do it. · WhatsApp automation The wider catalogue: 24 agents built on this API, filtered by the industry you are in. ## Frequently asked questions Short answers to the questions that bring most readers to these docs. WhatsApp Business API is Meta's official interface for medium and large businesses to communicate with customers at scale. Unlike the regular WhatsApp Business app, the API allows integration with CRM systems, automated messaging, chatbots, and supports unlimited agents on a single number. Meta charges per template message delivered, priced by the recipient's country and the template's category. Meta publishes a rate card per billing currency, and an account is billed on the card for its own currency. On Meta's US dollar card effective 1 July 2026, a Singapore number is US$0.0732 for marketing and US$0.0160 for utility and authentication. On Meta's Singapore dollar card, also effective 1 July 2026, the same two rates are S$0.0937 and S$0.0205. From 1 October 2026 Meta also charges for service messages, the replies you send inside a customer's 24-hour window. Each business number gets 1,000 free service messages a month, and Meta charges the market's utility rate beyond that. Rates differ by country and by message category. Error 131026 occurs when you try to send a message outside the 24-hour customer service window without using an approved message template. To fix it, either use a pre-approved template message or wait for the customer to message you first to reopen the 24-hour window. WhatsApp Business API has four messaging limit tiers: 1K (1,000 unique customers per 24 hours), 10K, 100K, and Unlimited. New accounts start at 1K and can upgrade by maintaining good quality ratings and sending sufficient message volumes. Message templates are created in Meta Business Manager under WhatsApp Manager > Message Templates. Templates must be approved by Meta before use, and Meta's template documentation says review can take up to 24 hours. They can include text, headers, buttons, and variables for personalisation. The 24-hour rule means you can only send free-form messages within 24 hours of a customer's last message. After 24 hours, you must use pre-approved message templates which require Meta approval. This protects users from spam and is strictly enforced. ## Ready to integrate WhatsApp? Voltade handles all the complexity of WhatsApp Business API integration. No coding required, just connect and start messaging. Talk to Volty · See what Voltade does ## Links - [the WhatsApp Business API hub](https://voltade.com/sg/whatsapp-business-api) - [What is WhatsApp Business API? The Complete Guide for 2026WhatsApp Business API is a programmable interface that allows medium to large businesses to broadcast messages to unlimited users, automate customer support with chatbots, and integrate with CRM systems. Unlike the free WhatsApp Business App, the API enables enterprise-scale customer communication.9 min readwhatsapp api](https://voltade.com/sg/learn/whatsapp/what-is-whatsapp-business-api) - [WhatsApp Business API pricing in Singapore: 2026 rates and 1 OctoberMeta charges S$0.0937 a marketing template in Singapore and S$0.0205 for utility, and bills service messages from 1 October 2026. Try the calculator.12 min readpricing](https://voltade.com/sg/learn/whatsapp/whatsapp-business-api-pricing) - [Understanding WhatsApp Business Messaging LimitsEvery WhatsApp Business account has a cap on how many unique customers you can message within a 24-hour window. This guide breaks down the different tiers, explains how Meta calculates your limit, and shows you proven strategies to scale up your messaging capacity over time.3 min readmessaging limits](https://voltade.com/sg/learn/whatsapp/whatsapp-messaging-limits) - [WhatsApp Pricing Changes: 1 October 2026Meta starts charging for service messages on 1 October 2026, moves nine markets to standalone rates and raises marketing in seven. Every rate from Meta's card.9 min readpricing](https://voltade.com/sg/learn/whatsapp/whatsapp-api-pricing-changes-october-2026) - [WhatsApp 24h Rule Explained: How Businesses Can Message Customers AgainUnderstand WhatsApp's 24-hour messaging window rule and learn how businesses can re-engage customers after the window closes. Discover how Voltade helps you send messages again with smart features.5 min read24-hour rule](https://voltade.com/sg/learn/whatsapp/whatsapp-24hr-rule) - [WhatsApp Template Best Practices: Get Approved, Avoid Rejection (2026 Guide)Write WhatsApp Business API templates that get approved fast, avoid auto-recategorization to Marketing, and survive Meta's quality rating system. With Singapore PDPA compliance notes for Voltade clients.8 min readtemplates](https://voltade.com/sg/learn/whatsapp/template-message-best-practices) - [How to Fix Meta Error 459 (Account Checkpoint)Error 459 from Meta indicates that your Facebook account has been checkpointed, meaning it is temporarily suspended for security reasons. This comprehensive guide shows you how to resolve this issue, including common scenarios like after paying for Meta verification.3 min readerror 459](https://voltade.com/sg/learn/whatsapp/meta-error-459-checkpoint) - [WhatsApp Coexistence Limitations: What You Need to KnowUsing WhatsApp Business App and Voltade together on the same number? Understand the key limitations of WhatsApp Coexistence mode, including the critical 14-day disconnection rule if you don't open the WhatsApp Business App regularly.4 min readcoexistence](https://voltade.com/sg/learn/whatsapp/whatsapp-coexistence-limitations) - [WhatsApp Account Blocked? How to Restore Access to Your Blocked AccountLearn how to restore access to your blocked WhatsApp account. This comprehensive guide covers temporary vs permanent blocks, 8 common reasons for account blocking, step-by-step recovery instructions, and proactive measures to prevent future blocks.11 min readblocked account](https://voltade.com/sg/learn/whatsapp/whatsapp-account-blocked-restore-access) - [WhatsApp Error 131026: Message Undeliverable - Complete Troubleshooting GuideFix WhatsApp Error 131026 with this comprehensive troubleshooting guide. Learn all 10 causes of message delivery failures including recipient issues, template problems, and India-specific restrictions. Includes step-by-step debug checklist and prevention best practices.7 min readerror 131026](https://voltade.com/sg/learn/whatsapp/whatsapp-error-131026-message-undeliverable) - [WhatsApp Error Code 131060: Companion Device Message Visibility IssueLearn how to resolve WhatsApp error code 131060, which occurs when messages are sent from companion devices in Coexistence mode. Understand why this happens and how Voltade displays these errors clearly.3 min readerror 131060](https://voltade.com/sg/learn/whatsapp/whatsapp-error-131060-companion-device) - [WhatsApp Error: Object With ID Does Not Exist or Missing PermissionsFix the WhatsApp Business API error 'Unsupported post request. Object with ID does not exist, cannot be loaded due to missing permissions, or does not support this operation' by reauthorizing your Facebook connection.2 min readerror](https://voltade.com/sg/learn/whatsapp/whatsapp-error-object-does-not-exist) - [WhatsApp Error: Session Has Expired, Access Token Validation FailedFix the WhatsApp Business API error 'Error validating access token: Session has expired' by reauthorizing your Facebook connection. Step-by-step guide to fix expired session issues.2 min readerror](https://voltade.com/sg/learn/whatsapp/whatsapp-error-session-expired) - [How To Unban Your WhatsApp Account Within 24hLearn how to appeal a WhatsApp ban and get your account restored. This guide covers temporary vs permanent bans, the official appeal process, email templates, and tips to avoid future bans for Singapore businesses.7 min readbanned](https://voltade.com/sg/learn/whatsapp/how-to-unban-whatsapp-account) - [WhatsApp Error #3: Application Does Not Have API Granular PermissionFix the WhatsApp Business API error '(#3) Application does not have the API granular permission to make this call' by reauthorizing your Facebook connection and granting required permissions.2 min readerror](https://voltade.com/sg/learn/whatsapp/whatsapp-error-api-granular-permission) - [WhatsApp Error #200: You Do Not Have Permission to Send MessagesFix the WhatsApp Business API error '(#200) You do not have the necessary permissions required to send messages on behalf of this WhatsApp Business Account' with solutions for both Coexistence and Non-Coexistence flows.2 min readerror 200](https://voltade.com/sg/learn/whatsapp/whatsapp-error-200-no-permission-send-messages) - [Unable to Remove WhatsApp Business App from Meta Business PortfolioCannot remove WhatsApp Business app from your Meta Business Portfolio? Learn how to fix this by adjusting your 2FA settings in Meta Business Suite before attempting removal.2 min readmeta business suite](https://voltade.com/sg/learn/whatsapp/whatsapp-unable-remove-from-meta-portfolio) - [WhatsApp Error: You Cannot Access the App Till You Log In to FacebookFix the WhatsApp Business API error 'You cannot access the app till you log in to www.facebook.com and follow the instructions given' by completing the Facebook verification process.2 min readerror](https://voltade.com/sg/learn/whatsapp/whatsapp-error-facebook-login-verification) - [WhatsApp Error: Unable to Update Contact, Email Already TakenFix the WhatsApp CRM error 'Unable to update contact. Please try again later' caused by duplicate email addresses in your contact database.2 min readerror](https://voltade.com/sg/learn/whatsapp/whatsapp-error-unable-update-contact-email) - [WhatsApp Error: Template Name Not Found, 24-Hour Rule ExplainedFix the WhatsApp Business API error 'Template name not found' by understanding the 24-hour messaging window and how to use pre-approved message templates correctly.2 min readerror](https://voltade.com/sg/learn/whatsapp/whatsapp-error-template-name-not-found) - [WhatsApp Error: Need to Add Payment Method for Broadcast CampaignsFix the WhatsApp Business API error 'Need to add payment method first in order to use the WhatsApp campaign broadcast feature' by configuring payment settings in Meta Business Portfolio.2 min readerror](https://voltade.com/sg/learn/whatsapp/whatsapp-error-add-payment-method) - [WhatsApp Error 131042: Business Eligibility Payment Issue, 72 Hour BlockFix WhatsApp Business API error 131042 (business eligibility payment issue) by waiting 72 hours and avoiding retry attempts. Learn why this block happens and how to prevent it.2 min readerror 131042](https://voltade.com/sg/learn/whatsapp/whatsapp-error-131042-payment-issue) - [WhatsApp Error: Phone Number Not Eligible to Connect to Business PlatformFix the WhatsApp error 'Your phone number is not eligible to connect to the WhatsApp Business Platform' by increasing app activity and recreating your account before onboarding.2 min readerror](https://voltade.com/sg/learn/whatsapp/whatsapp-error-phone-number-not-eligible) - [WhatsApp Error: Phone Number Already Registered with INBOX ProductFix the WhatsApp error 'This phone number is already registered with the INBOX product' by disconnecting the existing partner before onboarding with a new platform.2 min readerror](https://voltade.com/sg/learn/whatsapp/whatsapp-error-already-registered-inbox) - [WhatsApp Disconnection: Messages Are Now End-to-End Encrypted WarningFix WhatsApp Business API disconnection identified by the yellow 'Messages and calls are now end-to-end encrypted' text. Learn how to re-onboard your number and restore connection.2 min readdisconnected](https://voltade.com/sg/learn/whatsapp/whatsapp-disconnected-end-to-end-encrypted) - [WhatsApp Error: This Account Can No Longer Use WhatsApp, Appeal GuideFix the WhatsApp ban message 'This account can no longer use WhatsApp' by submitting a review request through Meta Direct Support. Step-by-step appeal process for banned accounts.2 min readbanned](https://voltade.com/sg/learn/whatsapp/whatsapp-error-account-can-no-longer-use) - [WhatsApp Business API Known Issues and Solutions (2026)A practical troubleshooting index for common WhatsApp Business API issues, with root causes, fixes, and escalation paths for Singapore teams using Voltade.2 min readwhatsapp business api](https://voltade.com/sg/learn/whatsapp/known-issues-and-solutions) - [WhatsApp chatbotWhat a chatbot is, what Meta charges per message, and where a scripted bot stops being enough.](https://voltade.com/sg/whatsapp-chatbot) - [WhatsApp AI agentWhat an agent does that a chatbot cannot, and what it needs write access to in order to do it.](https://voltade.com/sg/whatsapp-ai-agent) - [WhatsApp automationThe wider catalogue: 24 agents built on this API, filtered by the industry you are in.](https://voltade.com/sg/whatsapp-automation) - [See what Voltade does](https://voltade.com/sg/whatsapp-automation/customer-engagement)