To connect your Salesforce account with Zoho Forms, your Salesforce administrator should enable API access for you.
To use Salesforce API, your organization must be on one of the following 4 editions (the API is enabled by default):
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Enterprise Edition
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Unlimited Edition
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Developer Edition
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Performance Edition
Enabling API access in Salesforce by Profile
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Click Setup.
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Click Manage Users > Profiles.
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Click Edit
next to the specific Profile.
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Scroll down to Administrative Permissions and select API Enabled.
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Click Save.
Enabling API Access in Salesforce by Permission Set