We would like inform you that payment will be pay by 3/29, please provide the bank details for remittance.
This question appears to be off-topic. The users who voted to close gave this specific reason:
- "Proofreading questions are off-topic unless a specific source of concern in the text is clearly identified." – J. Taylor, sumelic, Lawrence, Hellion, Davo
You're almost there! Your sentence is missing the preposition "to," which needs to be placed before "inform." Tenses need to be kept consistent as well. Lastly, I noticed a comma splice: it is a grammatical error that occurs when a comma is used to separate two independent clauses. Lastly, using "processed" instead of "pay" will make your sentence sound more professional.
As such, the correct sentence is this:
We would like to inform you that the payment will be processed by 3/29. Please provide the bank details for remittance.