Change "You can schedule text messages to be sent at a later date or time, or can create recurring text message sessions with TextMagic API."
to
"With the TextMagic API, you can send SMS text messages at a specific time or on a recurring schedule."
Change "Schedule a message for sending once" to something like "Schedule a message at a specific time" or "Schedule a one-time message" NOTE: the phrase "sending once" sounds awkward in English.
Change "To ensure a scheduled session delivery, your account will be charged right after creating a new session. This way, you can be sure that your session will be sent, even if you did not have sufficient balance at the time the message was actually sent."
to
"Your account will be charged right after creating a new schedule message. This ensures that your message will be sent even if you no longer have a sufficient balance at the time the message is delivered."
Change "You may schedule sending messages" to
"You may schedule messages"
Change "To send an SMS message with the text “Happy New Year!” to +447860021130 on 1 January 2016, 00:00:00 UTC, write:"
to
"To send an SMS message with the text “Happy New Year!” to +447860021130 on 1 January 2016, 00:00:00 UTC, execute:"
Change "As you can see, only the schedule field is filled. The other fields (such as session and messages) will be filled later."
to
"As you can see, the sessionId and messageId fields are null, they will be populated later when the message is sent."
Change "Schedule a message for repeat-sending" to
"Schedule a message on a recurring schedule". NOTE: the phrase "repeat-sending" sounds odd.
Change "However, note, this is a bit tricky because you need to prepare an iCal RRULE string, so first, carefully read all the necessary string formatting rules."
to
"Please note that this may seem a bit complicated because you need to create an iCal RRULE string. If you've never used this recurring event format before, be sure to read the iCal documentation."
This sentence is confusing: "Note, the response is different from the previous example:" It's true that the response is different but the only difference is the schedule ID. I would expect that to be true even if I created another non-repeating scheduled message (it is true). I suggest removing this sentence.
Change "where id is a numeric schedule ID."
to "where id is the numeric ID of the scheduled message."
Change "The response is:" to
"The response will look like:"
Change "Schedule ID."
to
"The scheduled message ID."
Change "See Sessions section for"
to
"See the Sessions section for"
Change "If the scheduled sending was not completed at the time of deletion, your account will be refunded for the next session sending cost."
to
"If you delete a scheduled message before it is sent, your account will be refunded the fee for the message."
Change "You can now use TextMagic API to manage and schedule text messages online. Please check the section on message Sessions. . ."
to
"You can now use TextMagic API to manage and schedule text messages. Please see the section on message Sessions. . ."
https://www.textmagic.com/docs/api/schedule-sms/