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Sms gateway setting for smsgateway.me

hi everyone , I try to manage sending a SMS via SMS Center. The htmi api works as below:
https://smsgateway.me/sms-api-documentation/messages/sending-a-sms-message

my problem was the api token key more than 140 character , then mysql not excepted.

i try to edit the sms parameter form from data to text by follow this link https://erpnext.com/docs/user/manual/en/customize-erpnext/articles/maximum-number-of-fields-in-a-form
but the SMS setting get error while saving "pymysql.err.DataError: (1406, “Data too long for column ‘value’ at row 1”)"

ERPNEXT version
ERPNext: v12.5.2 (version-12)
Frappe Framework: v12.3.0 (version-12)

Any help would be great.
Thanks