Rate limit - Global pool (i.e. 50 requests per second per domain)

Key points to consider:

• anchorType must match the subscription's current billing frequency and cannot be used to change it. A weekly subscription only accepts WEEKDAY, a monthly subscription only MONTHDAY, and a yearly subscription only YEARDAY. Sending a mismatched anchorType will return an error.
• anchorType is case-sensitive and must be passed in uppercase (WEEKDAY, MONTHDAY, or YEARDAY).
• anchorDay accepts 1 to 7 for WEEKDAY (1 = Monday, 7 = Sunday), and 1 to 31 for MONTHDAY.
• For YEARDAY, anchorDay accepts 1 to 31, but the valid value depends on the anchorMonth passed. It must be a real calendar date for that month. For example, anchorMonth: 6 (June) only accepts anchorDay between 1 to 30, since June has no 31st day.
• anchorMonth is required only when anchorType is YEARDAY, and accepts 1 to 12 (1 = January, 12 = December). For WEEKDAY and MONTHDAY, pass any value greater than 0 in anchorMonth
• To disable anchor on an existing subscription, pass null in anchorType and a non-null value in anchorDay.

Note: Anchor disabling can't be tested directly from this page. To test it on your end, send a request with anchorType set to null (small case) and anchorDay set to a non-null value.