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How do I set multiple values for checkbox properties?

When setting multiple values for a checkox property, the values should be separated with a semicolon (;).

When updating a record through the Contacts API, the property value should be a single string with all of the values separated by semicolons:

    "property": "property_name",
    "value": "value1;value3;value4"


For the Forms API, make sure that the semicolons are also URL encoded: