Exact Online is notorious for its API limitations. If these limits are reached, the API throws HTTP 429 - Too Many Requests. More information about such limitations can be found in Exact Knowledge Base.
A possible workaround is setting two connection properties (MaximumRequestRetries and RetryWaitTime) through the Other property in the driver configuration, to tweak how the retry logic works.
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MaximumRequestRetries is the maximum number of times to retry a request if we get the error, while
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RetryWaitTime is how long to wait before retrying a request in milliseconds.
Below is a screenshot that demonstrates how to set these properties and their corresponding values:
The other recommendation would be to use a custom OAuth App since our embedded app has a much smaller API limit.