If you are using the Data API to set Custom codes, please be aware that there is a Character limit on Custom codes on the Platform. This will be applicable for the below endpoints:
https://dataapi.justgiving.com/docs/resources/v1/CustomCodes/SetCustomCodesForPage
https://dataapi.justgiving.com/docs/resources/v1/CustomCodes/SetCustomCodesForPages
https://dataapi.justgiving.com/docs/resources/v1/CustomCodes/SetCustomCodesForEvent
https://dataapi.justgiving.com/docs/resources/v1/CustomCodes/SetCustomCodesForEvents
For more information on Custom codes you can visit this heldesk article: https://justgiving-charitysupport.zendesk.com/hc/en-us/articles/14482268160145-Adding-custom-codes-to-your-data