Probable Causes
- Recipient phone number formatted with + sign or spaces (Meta requires digits only: country code + number)
- Misspelled JSON key (e.g. recipient_types instead of recipient_type)
- Invalid component type string in template parameters
Meta API Error Codes
Error 100
400 Bad Request
WhatsApp Error 100: Invalid Parameter — Payload Syntax Resolution
Error 100 is a generic invalid parameter exception indicating that a field name is misspelled, a value does not adhere to allowed enums, or required parameters are missing.
Step-by-Step Resolution
Recommended Fix Protocol:
Strip all spaces, hyphens, and + signs from phone numbers before calling the API (e.g. 918779713123). Validate your payload JSON against official Meta Graph API v20+ schema specifications.
Technical Example / Code Payload:
// Correct Phone Number Formatting
$cleanNumber = preg_replace('/[^0-9]/', '', $rawPhone); // Output: 918779713123
Quick Answers
Frequently Asked Questions
Should phone numbers include the + symbol?+
No. WhatsApp Cloud API requires country code and subscriber number with digits only (no leading + or 00).
Can I send messages to landline numbers?+
No. WhatsApp Business API only delivers to active mobile phone numbers.
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