26. Is there a ban on donors to political parties/candidates participating in public tender/procurement processes?

Decree No. 2014-1039 of March 13, 2014, regulating public procurement: 
Art. 56 – The public procurement offer must be accompanied by the following documents:
[...] a declaration on honor presented by the tenderers specifying their commitment not to have made and not to make, by themselves or through an intermediary, any promises, donations, or presents with a view to influencing the different procedures for concluding a contract and the stages of its execution.

Unofficial English translation.

The provisions do not regulate clearly this aspect. Importantly, one provision says that every applicant shall confirm not to have made donations to alter the process.