params: JSON string of batch sent messages
msg_batch_send_param_identifier_array: Write-only (required). List of recipient UserIDs for batch message sending.
msg_batch_send_param_msg: Write-only (required). Messages sent in batches.
param user_data
user_data User-defined data. The IM SDK only transfers the user data to the callback function cb without processing the data.
params: JSON string of batch sent messages msg_batch_send_param_identifier_array: Write-only (required). List of recipient UserIDs for batch message sending. msg_batch_send_param_msg: Write-only (required). Messages sent in batches.
user_data User-defined data. The IM SDK only transfers the user data to the callback function cb without processing the data.